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.

Question: What age bracket plays for the Real Madrid's youth system? Passage:Casillas began his career in Real Madrid's youth system, known as La Fabrica, during the 199091 season. On 27 November 1997, at age 16 and still a junior, he was first called up to the senior team squad to face Rosenborg in the UEFA Champions League, although he remained on the bench throughout. After spending a season with the C-team in the fourth tier, during which they won their regional group, he came into contention as the club's first-choice between the posts. In starting the 19992000 UEFA Champions League group stage fixture against Olympiakos on 15 September 1999, he became the youngest goalkeeper ever to feature in the competition at the time, aged 18 years and 177 days; a record which was only broken in October 2017 by Mile Svilar. Three days earlier, Casillas had made his La Liga debut in a 22 draw against Athletic Bilbao at San Mames Stadium. In May 2000, he became the youngest ever goalkeeper to play in and win a Champions League final when Real Madrid defeated Valencia 30, just four days after his 19th birthday.
Links: a. Olympiacos F.C. b. Real Madrid CF (youth) c. La Fabrica d. Real Madrid CF (youth)
b

Question: How big was the Royal Air Force the year York joined Aston Villa? Passage:York started his career with Handsworth Royal, Birchfield Rangers and the Royal Air Force, and also guested for Chelsea during World War I. In March 1915 he joined Aston Villa as an amateur, signing professional forms in August 1919. He scored one goal in 17 games in 191920, but did not feature in the 1920 FA Cup Final, which ended in a 10 victory over Huddersfield Town at Stamford Bridge. He appeared just 11 times in 192021, before going on to make 47 appearances in the 192122 campaign, as the "Villans" finished fifth in the First Division. He scored nine goals in 37 games in 192223 and five goals in 43 games in 192324. He also appeared at Wembley in the 1924 FA Cup Final, in a 20 defeat to Newcastle United. He scored seven goals in 34 matches in 192425, before hitting 20 goals in 44 appearances in 192526. He bagged 13 goals in 43 games in 192627, before being limited to just four goals in 30 appearances in 192728. He rediscovered his scoring form with 18 strikes in 48 matches in 192829, before hitting seven goals in 32 games in 192930. However he played just four times in the 193031 campaign, as Villa finished second in the league with an English record of 128 top-flight league goals scored.
Links: a. 192324 Football League b. Royal Air Force c. Huddersfield Town A.F.C. d. Royal Air Force
b

Question: The stadium where Penson got his lone MLB win was home to what baseball team? Passage:Penson's professional career began in April 1954 after he had had a successful three-year skein as a pitcher while he served in the military. Penson won 50 games pitching for his base team, although sources disagree about the branch in which he served, reported as the United States Air Force and the U.S. Army. Penson made the Phillies out of training camp in 1954 as a member of the team's early-season, 28-man roster. His five games pitched included three starts, and he split two decisions. His lone MLB win came in his first start, on Sunday, May 16, 1954. in the second game of a doubleheader at Connie Mack Stadium. He went six innings against the St. Louis Cardinals, and allowed four hits, four bases on balls, and one earned run. But he was forced to leave the game leading 63 when the game was suspended because of Pennsylvania blue laws prohibiting sporting events on Sunday evenings. The game resumed on Monday, May 17, and Philadelphia went on to win, 84; veteran Murry Dickson nailed down the save with three innings of one-run relief.
Links: a. Save (baseball) b. Shibe Park c. Pennsylvania d. Shibe Park
b