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: What year was Georgia Southern founded? Passage:The Georgia Southern Eagles football program represents Georgia Southern University in football as part of the Sun Belt Conference under head coach Chad Lunsford. The Eagles have won six FCS (I-AA) national championships and have produced two Walter Payton Award winners. The Eagles first continuously fielded a football team in 1924; however, play was suspended for World War II and revived in 1981. The Eagles competed as an FCS independent from 1984 until 1992 as the Eagles' main conference at the time, the Trans America Athletic Conference (now known as the Atlantic Sun Conference), did not sponsor football, and as a member of the Southern Conference from 1993 until 2013, winning 10 SoCon championships. Georgia Southern joined the Sun Belt Conference upon transitioning to the FBS level in 2014. The Eagles won the Sun Belt Conference championship outright in its first year as an FBS member. Georgia Southern's main Sun Belt rival is Appalachian State.
 Links: a. World War II b. Georgia Southern University c. Atlantic Sun Conference d. Atlantic Sun Conference
Example Output: b

Example Input: Question: Did Oerter stay in Germany after he moved away from Bavaria? Passage:By the early 1890s he had moved away from Bavaria and, with his brother, was working in Duisburg. Together the brothers smuggled subversive anarchist literature into Germany from the Netherlands. Coming under increasing police pressure, and taking his queue from a number of other anarchist comrades in a similar predicament, early in 1892 he fled to the United States of America. On his arrival at New York he met up with the circle around Emma Goldman, Alexander Berkman, and politically like-minded comrades from Germany. Sepp Orter discovered in himself a talent for activism, turning out to have a flair for public speaking. During 1892 he was also the editor of the New York version of , published by the "Radical Workers' Association" ("Radikaler Arbeiter Bund") and the "Autonomy" group which also numbered among its members Josef Peukert. The stay in America was cut short, however. The authorities suspected that Oerter had somehow been involved in Alexander Berkman's attempt to assassinate a wealthy businessman called Henry Clay Frick. Those suspicions appear not to have been entirely unfounded. With financial assistance from Emma Goldman, Sepp Oerter returned to Germany. He travelled via London where he arrived in October, and where the editorial group publishing "Autonomy" gave him a mission to take printed material across Belgium to the German frontier in order to effect a clandestine introduction of the anarchist propaganda to Germany. Sepp Oerter was able to complete his mission with the help of his brother Fritz who had stayed behind when Sepp had escaped to America.
 Links: a. Josef Peukert b. Emma Goldman c. Emma Goldman d. Duisburg
Example Output: d

Example Input: Question: How old was the German king Thomas alerted of his ascension when Tvrtko died? Passage:Tvrtko II died in November 1443. The Stanak approved his choice of heir, and Thomas was duly elected king by 5 December. Like his predecessors, he added the royal name Stephen to his own. However, the kingdom's most powerful magnate, Grand Duke Stjepan Vukčić Kosača, refused to accept Thomas as king, and announced his support for Radivoj. The authorities of the neighbouring Republic of Ragusa immediately expressed concern about the situation. Kosača and Radivoj appealed to Ragusa not to recognize Thomas as king, but to no avail. Simultaneously, Hermann's grandson Ulrich II pressed his claim to the Bosnian throne and tried to gather support among Thomas's opponents. Because of this, Thomas hastened to send word of his accession to foreign rulers, including the German king Frederick IV, Ulrich's rival, and Ragusan and Venetian authorities, hoping to receive recognition. Ulrich was occupied with the feud waged against him by Frederick, as well as with the succession struggle in Hungary, where he had taken side with his cousin, queen dowager Elizabeth of Luxembourg and her infant son Ladislaus against the reigning monarch Vladislav I, leaving Thomas ample space of maneuver.
 Links: a. Frederick III, Holy Roman Emperor b. Frederick III, Holy Roman Emperor c. Ulrich II, Count of Celje d. Frederick III, Holy Roman Emperor
Example Output:
a