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.

Example Input: Question: Did Blake or Philby defect first? Passage:In May 1986, Souther requested Soviet citizenship, aware that the investigation against him was progressing. In June, fearing imminent arrest, Souther defected to the Soviet Union by flying from the United States to Rome, where the Soviet intelligence services transferred him to Moscow. Initially, Soviet counterintelligence units were suspicious of Souther's defection and feared that he was a double agent for the CIA, but he was cleared shortly afterwards. On 2 October 1986, Souther was granted Soviet citizenship in a decree from the Presidium of the Supreme Soviet, and adopted the Russian name Mikhail Yevgenyevich Orlov. Souther was well-received by the Soviet authorities, gifting him an apartment in Moscow and a dacha on the outskirts of the city, and promoting him to the rank of major in the KGB – one of few foreign spies to be commissioned as an officer in the agency. Souther became actively engaged in scientific activities, developed his own English teaching program, walked around Moscow a lot, and travelled to other Soviet cities. Souther met and befriended other foreign Soviet intelligence agents that had defected including Kim Philby and George Blake. Souther married a Russian woman named Elena, an English teacher at the Intelligence Institute, and they had a daughter named Alexandra. In early 1989, Souther was awarded an Order of Friendship of Peoples for his contributions in the intelligence services following a petition from the KGB leadership.
 Links: a. George Blake b. George Blake c. Dacha d. Major
Example Output: a

Example Input: Question: How many teams played in the Malaysia Premier League the year Ferns made his debut for Felda United? Passage:Ferns made his debut for Felda United F.C. in the Malaysia Super League with a 2-1 win against Pahang FA in July 2017. Under the guidance of head coach B. Sathianathan, Ferns made a successful contribution, helping the team reach 3rd place in the Malaysia Super League and semi-final of the Malaysia Cup. Unfortunately, in the off-season of 2017 the club was notified it was being relegated to the Malaysia Premier League for the 2018 season after failing the Football Association of Malaysia club licence financial audit. Despite this setback, Ferns and the majority of the squad stayed at the club to help Felda United F.C win the title and secure promotion back to the Malaysia Super League for 2019. 
 Links: a. FELDA United F.C. b. 2018 Felda United F.C. season c. 2018 Malaysia Premier League d. 2018 Malaysia Premier League
Example Output: c

Example Input: Question: How long had the WACA Ground been in existence for the year Millar was part of a pace attack that included David Boyd? Passage:Geoffrey Alan Millar (born 22 November 1955) is a former Australian cricketer who played several matches for Western Australia during the early 1980s. From Perth, Millar played at colts level during the late 1970s, generally as an all-rounder. He made his Sheffield Shield debut for Western Australia during the 1981–82 competition, and failed to take a wicket in what was to be his only first-class match. In the match, against Queensland at the WACA Ground in February 1982, he was part of a pace attack that included David Boyd (who he opened the bowling with in the first innings), Mick Malone, and Ken MacLeay. Millar also appeared at List A level several times for Western Australia. In his first match, the third-place playoff of the 1981–82 McDonald's Cup, he took 2/17 and scored 30 runs, and was thus named man of the match. His two further matches both occurred in the following year's tournament. At grade cricket level, Millar played 177 matches for the Mount Lawley District Cricket Club.
 Links: a. Mount Lawley District Cricket Club b. Western Australia cricket team c. WACA Ground d. Mount Lawley District Cricket Club
Example Output:
c