Question: During what season of Europe's secondary club football tournament was the  2017 UEFA Europa League Final, where Manchester United finished in sixth place?

full_context: Document 1: 2007 FA Cup Final: The 2007 FA Cup Final was played on Saturday, 19 May 2007 between Chelsea and Manchester United. It was the 126th FA Cup Final and the first to be played at the new Wembley Stadium. Manchester United suffered a 1–0 defeat to Chelsea by Didier Drogba's extra time goal, completing a domestic cup double for the Blues in the 2006–07 season, as they had already won the League Cup Final in February . While United were favourite for playing a double of their own as they had recently beaten Chelsea to the Premier League title two weeks earlier. The game was widely considered to be a disappointment by pundits and fans alike. As a result of Manchester United and Chelsea having already been guaranteed qualification for the UEFA Champions League, the UEFA Cup entry for the FA Cup winner/runner-up went instead to the highest positioned Premier League team who hadn't already qualified for Europe: Bolton Wanderers.
Document 2: 2017 UEFA Champions League Final: The 2017 UEFA Champions League Final was the final match of the 2016–17 UEFA Champions League, the 62nd season of Europe's premier club football tournament organised by UEFA, and the 25th season since it was renamed from the European Champion Clubs' Cup to the UEFA Champions League. It was played at the Millennium Stadium in Cardiff, Wales on 3 June 2017, between Italian side Juventus and Spanish side and title holders Real Madrid, in a repeat of the 1998 final. Real Madrid won the match 4–1 to secure their 12th title in this competition. With this victory, as the defending champions, Real Madrid became the first ever team to successfully defend their title in the Champions League era, and the first to do so since Milan in 1990. On the other hand, Juventus lost a fifth final in a row and a seventh in nine finals reached.
Document 3: 2017 UEFA Europa League Final: The 2017 UEFA Europa League Final was the final match of the 2016–17 UEFA Europa League, the 46th season of Europe's secondary club football tournament organised by UEFA, and the 8th season since it was renamed from the UEFA Cup to the UEFA Europa League. It was played at the Friends Arena in Solna, Sweden on 24 May 2017, between Dutch side Ajax and English side Manchester United. Manchester United won the match 2–0 to secure their first title in this competition. With this victory, they joined Juventus, Ajax, Bayern Munich and Chelsea as the only clubs to have won all three major European trophies (European Champion Clubs' Cup/UEFA Champions League, UEFA Cup/Europa League, and the now defunct UEFA Cup Winners' Cup).
Document 4: 2016 FA Community Shield: The 2016 FA Community Shield (also known as the 2016 FA Community Shield supported by McDonald's for sponsorship reasons) was the 94th FA Community Shield, an annual English football match played between the winners of the previous season's Premier League and FA Cup. The match was contested by 2015–16 FA Cup winners Manchester United, and Leicester City, champions of the 2015–16 Premier League. It was held at Wembley Stadium a week before the Premier League season kicked off. Manchester United won the match 2–1 with goals from Jesse Lingard and Zlatan Ibrahimović, either side of a goal from Leicester striker Jamie Vardy.
Document 5: AFC Ajax in European football: AFC Ajax is one of the most successful football clubs in Europe. There are only three clubs in the history of the game to have won the European Cup/Champions League titles (won four times by Ajax) three times consecutively. Only Real Madrid and Bayern Munich have achieved this feat aside from Ajax. Furthermore, Ajax have won the UEFA Cup Winners' Cup once, the UEFA Cup once, the UEFA Super Cup three times, the Intercontinental Cup twice and the International Football Cup once. The club has also appeared in three additional finals finishing as runners-up. In the 1979–80 season, Ajax player Søren Lerby was top scorer of the European Cup with 10 goals. Below is a list of all official European matches contested by Ajax.
Document 6: 2000–01 Manchester United F.C. season: The 2000–01 season was Manchester United's ninth season in the Premier League, and their 26th consecutive season in the top division of English football. United won the Premier League for the third successive season and the seventh time since its inauguration in 1993. They were less successful in cup competitions, going out in the fourth round of the FA Cup, the fourth round of the League Cup and the quarter-finals of the Champions League.
Document 7: 2011–12 Manchester City F.C. season: The 2011–12 season was Manchester City Football Club's 110th season of football, its tenth consecutive season in the Premier League, and its fifteenth season in the Premier League. The club also played in the UEFA Champions League for only the second time, and the first time since its rebranding from being the European Cup, after finishing third in the 2010–11 Premier League. Manchester City's U19 squad will play in the inaugural tournament of the NextGen series.
Document 8: 2016–17 Manchester United F.C. season: The 2016–17 season was Manchester United's 25th season in the Premier League, and their 42nd consecutive season in the top-flight of English football. It began against Leicester City in the FA Community Shield, with United prevailing 2–1 to win the first trophy of the domestic calendar. In February 2017, the club won their second trophy of the campaign, beating Southampton 3–2 in the EFL Cup Final. Although they missed out on qualifying for the 2017–18 UEFA Champions League via the league, having finished in sixth place, a 2–0 victory over Ajax in the 2017 UEFA Europa League Final meant they qualified for the Champions League group stage as Europa League title holders.
Document 9: 2016 UEFA Europa League Final: The 2016 UEFA Europa League Final was the final match of the 2015–16 UEFA Europa League, the 45th season of Europe's secondary club football tournament organised by UEFA, and the seventh season since it was renamed from the UEFA Cup to the UEFA Europa League. It was played at the St. Jakob-Park in Basel, Switzerland on 18 May 2016, between English team Liverpool and Spanish team and two-time defending champions Sevilla. Sevilla won the match 3–1 to become the first team to win the UEFA Cup/Europa League three times in a row; it was their record fifth title overall.
Document 10: 2015–16 Southampton F.C. season: The 2015–16 Southampton F.C. season was the club's 17th season in the Premier League and their 39th in the top division of English football. It was also the club's first season in a European competition since 2003–04. Southampton finished the season in sixth place in the Premier League, having won 18, drawn 9 and lost 11 of their 38 matches. This result is the highest club finish in the Premier League and the highest Premier League points total (63) in the club's history. Aside from the league, the club was eliminated from the third round of the FA Cup, the fifth round of the League Cup, and the qualifying play-off round of the UEFA Europa League.
Document 11: 2014 UEFA Europa League Final: The 2014 UEFA Europa League Final was the final match of the 2013–14 UEFA Europa League, the 43rd season of Europe's secondary club football tournament organised by UEFA, and the fifth season since it was renamed from the UEFA Cup to the UEFA Europa League. It was played at the Juventus Stadium in Turin, Italy on 14 May 2014, between Spanish side Sevilla and Portuguese side Benfica. Sevilla won the match 4–2 on penalties, following a 0–0 draw after extra time.
Document 12: 2013 UEFA Europa League Final: The 2013 UEFA Europa League Final was the final match of the 2012–13 UEFA Europa League, the 42nd season of Europe's secondary club football tournament organised by UEFA, and the 4th season since it was renamed from the UEFA Cup to the UEFA Europa League. The match was played at the Amsterdam Arena in Amsterdam, the Netherlands, on 15 May 2013, between Portuguese side Benfica and English side Chelsea. Chelsea won 2–1 to secure their first title in this competition.
Document 13: 2016–17 Southampton F.C. season: The 2016–17 Southampton F.C. season was the club's 18th season in the Premier League and their 40th in the top division of English football. In addition to the 2016–17 Premier League, the club also competed in the FA Cup, EFL Cup and UEFA Europa League. The season was the club's only campaign with manager Claude Puel, who took over from Ronald Koeman on 30 June 2016. The club finished eighth in the Premier League table, having won twelve, drawn ten and lost sixteen of their 38 matches played. They were knocked out of the UEFA Europa League at the group stage, having won two, drawn two and lost two of their matches, and the FA Cup in the fourth round, while they finished as runners-up in the EFL Cup Final losing 3–2 to Manchester United.
Document 14: 2015 UEFA Europa League Final: The 2015 UEFA Europa League Final was the final match of the 2014–15 UEFA Europa League, the 44th season of Europe's secondary club football tournament organised by UEFA, and the sixth season since it was renamed from the UEFA Cup to the UEFA Europa League. It was played at the National Stadium in Warsaw, Poland, on 27 May 2015, between Ukrainian side Dnipro Dnipropetrovsk and the title holders, Spanish side Sevilla. Sevilla won the match 3–2 for a record fourth title.
Document 15: 1973 European Cup Final: The 1973 European Cup Final was a football match held at the Red Star Stadium, Belgrade, on 30 May 1973, in which Ajax of the Netherlands defeated Juventus of Italy 1–0. A goal from Johnny Rep four minutes into the match was enough for Ajax to claim their third consecutive European Cup. This victory meant that Ajax had earned the privilege of keeping the trophy permanently. Juventus, however, got revenge 23 years later beating Ajax in the 1996 final in Rome.
ground_truth: 46th season