In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

[Q]: Question: How many miles long is the river that Silvanus drove the Alamanni tribesmen back from? Passage:Silvanus was born in Gaul, the son of Bonitus, a Laetic Frankish general who had supported Constantine I in the civil war against Licinius. Like so many other Franks of his times, and like his father before him, he was a loyal and thoroughly romanized "barbarian" in the military service of the Empire. By AD 351, he held the rank of tribune and was one of the senior officers who defected to Emperor Constantius II at the Battle of Mursa Major, after initially supporting the usurper Magnentius. An able soldier, Silvanus was eventually promoted to the rank of Magister militum per Gallias, a crucial post, then in AD 352-353, Constantius personally entrusted him with the difficult task of driving the Alamanni tribesmen raiding and looting in Gaul back beyond the Rhine, and restoring the fast eroding Roman authority in the province. This Silvanus fulfilled partly by bribing the Alamanni chieftains with the taxes he had collected, partly by defeating the Alamanni in battle and partly by suppressing the local bagaudae insurrections flaring up again in central and northern Gaul.
Links: a. Bonitus (magister militum) b. Constantine the Great c. Rhine d. Rhine
[A]: c

[Q]: Question: Who was the head coach for Ajax Youth Academy when Jozefzoon joined? Passage:A Winger and attacking midfielder, Jozefzoon began his career with spells at CTO '70 and AFC. He joined the Ajax Youth Academy in 2006 and signed a three-year professional contract in June 2008. Jozefzoon won his maiden call into the first team squad for the opening match of the 201011 Eredivisie season versus FC Groningen and remained an unused substitute during the 22 draw. He made his senior debut six days later, replacing Urby Emanuelson at half time during a 42 win over SBV Vitesse. He scored his only goal for the club in a 50 KNVB Becker third round win over MVV Maastricht on 22 September 2010. After five appearances during the 201011 season, Jozefzoon signed a one-year contract extension in June 2011, but spent the 201112 season away on loan and was released at the end of the season.
Links: a. SBV Vitesse b. SBV Vitesse c. Ajax Youth Academy d. Ajax Youth Academy
[A]: c

[Q]: Question: How old was the person who was awarded an American Soccer League franchise in 1987 when he died? Passage:In October 1987, the American Soccer League announced that it had awarded a franchise to Joe Robbie which would be located in Fort Lauderdale, Florida. Robbie, who owned the Minnesota Strikers of the Major Indoor Soccer League announced his intentions of resurrecting the name Fort Lauderdale Strikers and hired Wim Suurbier to coach the team. The team played their home games in Lockhart Stadium. In their first season, the Strikers stormed the ASL, finishing with a 14-6 record, best in the league, before falling to the Washington Diplomats in the finals. In 1988, Robbie later sold his share in the team to Noel Lemon. In January 1989, Suurbier resigned as coach to be replaced by Thomas Rongen. In their second season the Strikers did almost as well, finishing the season at 12-8. They went on to defeat the Boston Bolts for the 1989 championship. This qualified them for the 1989 National Pro Soccer Championship, the first American national outdoor soccer championship since the collapse of the North American Soccer League in 1984. On September 9, 1989, the Strikers defeated the San Diego Nomads of the Western Soccer League, 31, to win the title. Following that game, the ASL merged with the WSL to form the American Professional Soccer League. They played five more years in that league. For the 1990 season seven home games were played at Pompano Beach Municipal Stadium and five at the Royal Palm Polo Club in Boca Raton, after the Broward School Board denied the team access to Lockhart Stadium. In January 1991, the Strikers merged with the Orlando Lions. The combined team retained the Strikers name, uniforms and staff. Soon after Lemons sold the team to Bryan Lockwood.
Links: a. Boca Raton, Florida b. North American Soccer League c. Western Soccer Alliance d. Joe Robbie
[A]:
d