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 many tracks did the album released in 2004 have? Passage:Fulber rejoined the band in 2003. The reunited duo released the single "Maniacal" in October of that year. The single peaked at No. 15 on Billboards Hot Dance Singles. The next year, they released the studio album Civilization, which landed the No. 2 position on the German Alternative Albums chart. Peterson later rejoined the band to release Artificial Soldier in 2006. It was the first album to feature new members Jeremy Inkel and Jared Slingerland. The album peaked on Billboards Top Dance/Electronic Albums chart at No. 19. After a problem with the tour bus company, the US tour that year was cut short, and the band returned home to Vancouver after playing roughly half of their scheduled dates; performances in New York and Canada were cancelled. The band toured in Europe in August 2006, playing in 18 cities.
Links: a. 2003 in music b. Civilization (album) c. 2006 in music d. Civilization (album)
Example Output: b

Example Input: Question: Which city that Trey Parker and Matt Stone commuted to has a larger population? Passage:The film opens as South Park creators Trey Parker and Matt Stone leave New York City and the 2011 opening night of their Broadway production The Book of Mormon to return to Los Angeles to begin the fifteenth season of South Park. The documentary chronicles the production of the season premiere, "HumancentiPad", beginning the Thursday prior to airing. Parker and Stone, alongside producers Anne Garefino, Vernon Chatman, Bill Hader, and Susan Arneson, discuss ideas for the episode. Parker mentions his annoyance with downloading the latest version of iTunes, and being forced to comply with the software's long list of terms and conditions. The rant leads to ideas, with Parker instructing the storyboard team on how to stage a shot. The film covers various aspects of production, including voice acting, animation, lip sync, communication with standards and practices, character design, and editing.
Links: a. Bill Hader b. The Book of Mormon (musical) c. Broadway theatre d. New York City
Example Output: d

Example Input: Question: What is the population of the city where the body of water that feeds the Lac qui Parle River is located? Passage:The source of the river is Lake Hendricks on the boundary of Lincoln County, Minnesota, and Brookings County, South Dakota. It issues from the lake in Hendricks, Minnesota, and flows northeastwardly through northwestern Lincoln County as an intermittent stream on the Coteau des Prairies, a morainic plateau dividing the Mississippi and Missouri River watersheds, into western Yellow Medicine County, where it flows off the Coteau, dropping 250 feet (76 m) in eight miles (13km). Continuing northeastwardly through flat till plains with occasional willows and cottonwoods along its banks, the river flows into eastern Lac qui Parle County, passing to the east of Dawson. It flows into the Minnesota River just below Lac qui Parle Lake in Lac qui Parle State Park, approximately ten miles (15km) northwest of Montevideo, after flowing through a wooded valley in which it drops 210 feet (64 m) in 18 miles (29km). Lac qui Parle Lake was formed by a delta at the mouth of the Lac qui Parle River, and is maintained by a dam.
Links: a. Missouri River b. Willow c. Hendricks, Minnesota d. Moraine
Example Output:
c