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: In what year did Jackie Jensen with Most Valuable Player? Passage:Jack Eugene Jensen (March 9, 1927 July 14, 1982) was an American right fielder in Major League Baseball who played for three American League (AL) teams from 1950 to 1961, most notably the Boston Red Sox. He was named the AL's Most Valuable Player (MVP) in after hitting 35 home runs and leading the league with 122 runs batted in (RBIs); he also led the league in RBIs two other years, and in triples and stolen bases once each. Respected for his throwing arm, he won a Gold Glove Award and led the AL in assists and double plays twice each. He retired in his early thirties as major-league baseball expanded westward, due to an intense fear of flying. After being a two-sport star in college, Jensen was the first man to play in the Rose Bowl, the World Series, and the MLB All-Star Game.
Links: a. Major League Baseball Most Valuable Player Award b. Run batted in c. Right fielder d. Home run
Example Output: a

Example Input: Question: During what years was the Early Bronze Age? Passage:Iran is home to one of the world's oldest continuous major civilizations, with historical and urban settlements dating back to 7000 BC. The south-western and western part of the Iranian Plateau participated in the traditional Ancient Near East with Elam, from the Early Bronze Age, and later with various other peoples, such as the Kassites, Mannaeans, and Gutians. Georg Wilhelm Friedrich Hegel calls the Persians the "first Historical People". The Medes unified Iran as a nation and empire in 625 BC. The Achaemenid Empire (550330 BC), founded by Cyrus the Great, was the first true global superpower state and it ruled from the Balkans to North Africa and also Central Asia, spanning three continents, from their seat of power in Persis (Persepolis). It was the largest empire yet seen and the first world empire. The Achaemenid Empire was the only civilization in all of history to connect over 40% of the global population, accounting for approximately 49.4 million of the world's 112.4 million people in around 480 BC. They were succeeded by the Seleucid, Parthian, and Sasanian Empires, who successively governed Iran for almost 1,000 years and made Iran once again as a leading power in the world. Persia's arch-rival was the Roman Empire and its successor, the Byzantine Empire.
Links: a. Bronze Age b. Cyrus the Great c. Persepolis d. Central Asia
Example Output: a

Example Input: Question: What year did that freshman who led the Sooners' offense first attend the school? Passage:However, before the season began, Gresham suffered a season-ending injury. During the season opener against BYU, Bradford suffered an injury to his shoulder that forced him to sit out the next several games. The Sooners would go on to lose that game and their fourth game against Miami. Bradford returned for game number five against Baylor, but reinjured his shoulder the next week against Texas, ending his season and giving the Sooners their third loss of the season. The Sooners would continue to suffer many injuries throughout the remainder of the season including losing offensive linemen Jarvis Jones and Brody Eldridge, and defensive players Tom Wort, DeMarcus Granger and Auston English for the season. With freshman Landry Jones now leading the offense, the Sooners would go on win every home game from that point forward, including a season-ending win over in-state rival Oklahoma State, extending their NCAA-leading home winning streak to 30 games. However, the Sooners would also lose all but one of their away games. Oklahoma ended the regular season with seven wins and five losses (53 in the Big 12). The game marked Oklahoma's third appearance in the Sun Bowl. They were a perfect 2-0 in their previous games. In 1981, they defeated Houston 4014, and in 1993, they defeated Texas Tech 4110.
Links: a. Landry Jones b. 2009 BYU Cougars football team c. Landry Jones d. Landry Jones
Example Output:
a