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: How long is the river that's located in western Sweetwater County? Passage:It rises in western Wyoming, in northern Sublette County, on the western side of the Continental Divide in the Bridger–Teton National Forest in the Wind River Range. It flows south through Sublette County and western Wyoming in an area known as the Upper Green River Valley, then southwest and is joined by the Big Sandy River in western Sweetwater County. At the town of La Barge, it flows into Fontenelle Reservoir, formed by Fontenelle Dam. Below there, it flows through open sage covered rolling prairie where it is crossed by the Oregon, California and Mormon emigration trails and then further south until it flows past the town of Green River and into the Flaming Gorge Reservoir in Southwestern Wyoming, formed by the Flaming Gorge Dam in northeastern Utah. Prior to the creation of the reservoir, the Blacks Fork joined the Green River south of Green River, today the mouth of Blacks Fork is submerged by the reservoir.
 Links: a. Big Sandy River (Wyoming) b. Flaming Gorge Reservoir c. Sweetwater County, Wyoming d. Mormon Trail
Example Output: a

Example Input: Question: What was the Garland Fund used for? Passage:Vann stirred up controversy and 10,000 new readers by hiring George Schuyler in 1925, whose editorials and opinions made him famous as the "black H.L. Mencken" (who was a Courier subscriber). Under Vann, the Courier also worked as a tool for social progress. Most significantly, the paper extensively covered the injustices on African Americans perpetrated by the Pullman Company and supported the Brotherhood of Sleeping Car Porters. Vann wrote to gain support for causes such as improved housing conditions in the Hill District, better education for black students, and equal employment and union opportunities. However, Vann often used his Courier editorials to publicly fight with the National Association for the Advancement of Colored People (NAACP) and W. E. B. Du Bois over issues such as President Calvin Coolidge's grants of clemency to black soldiers involved in the Houston Riot and Vann's allegations that James Weldon Johnson embezzled money for personal use from the NAACP and the Garland Fund. This disharmony was resolved in 1929 by published apologies by Vann, Du Bois, and Johnson, and within the decade, Du Bois became a regular Courier contributor. But in 1938, Vann's Courier ended up at odds with the NAACP once again. Vann, through national campaigns and contact with President Franklin D. Roosevelt pursued inclusion of African-American units in the United States Armed Forces. Vann saw this as an achievable step on the path to integration of the military, but the NAACP leadership, primarily Walter White, publicly disagreed with this half-measure, despite the protests of Thurgood Marshall. As a result of the Courier′s influence and Vann's political clout, New York Congressman Fish successfully added an amendment prohibiting racial discrimination in selection and training of men drafted to the Selective Training and Service Act of 1940.
 Links: a. H. L. Mencken b. Hamilton Fish III c. Garland Fund d. United States Armed Forces
Example Output: c

Example Input: Question: Did the Earl of Kintore have any children when Anstruther-Gray became his Aide-de-Camp? Passage:He joined the Militia's Fife Artillery as a Sub-Lieutenant (Supernumerary) on 16 December 1876. He served for four years until he joined the 13th Hussars as a second lieutenant in 1880, served in India and Afghanistan in 1880-1881 and was promoted to lieutenant on 1 July 1881, before transferring to the Royal Horse Guards in 1885. He was Aide-de-Camp to the Earl of Kintore, Governor of South Australia, from 1889-1891, was promoted to captain on 30 December 1893, and to major on 1 May 1897. He served in South Africa from 1901-1902 where he was commandant of the district of Knysna in 1901, and Inspector of Concentration Camps in Transvaal in 1902. Following the end of the war in June 1902, he returned to the United Kingdom in the SS Dunottar Castle, which arrived at Southampton in July 1902. He later commanded 3rd Line Group, Scottish Horse during World War I.
 Links: a. Major (United Kingdom) b. Algernon Keith-Falconer, 9th Earl of Kintore c. World War I d. Major (United Kingdom)
Example Output:
b