Definition: 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.
Input: Question: When was the first time badminton was played at the olympics? Passage:Ge Fei (; born 9 October 1975) is a retired Chinese badminton player in the 1990s who is one of the most successful doubles specialists in the sport's history. Among many international titles, Ge won two Olympic gold medals and two IBF World Championship gold medals in the women's doubles with her regular partner Gu Jun and a World Championship gold medal in the mixed doubles with Liu Yong. Ge was also a member of Chinese teams that captured the Uber Cup (women's world team trophy) in 1998 and 2000. Ge and Gu Jun were the world's dominant women's doubles team from the mid-1990s to their retirement after the 2000 Olympics, winning over thirty top tier international titles together. Ge Fei was elected to the Hall of Fame in 2008.
 Links: a. Badminton b. BWF World Championships c. Badminton at the Summer Olympics d. 2000 Thomas & Uber Cup
Output:
c