Instructions: 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: What was the first flight with Charlesworth as the flight director to involve extravehicular activity? Passage:Clifford Eugene Charlesworth was born on November 29, 1931, in Red Wing, Minnesota, and grew up in Mississippi. He completed his education at Mississippi College with a bachelor's degree in physics in 1958. After a time as a civil servant with the United States Navy and the Pershing missile program of the United States Army, he joined NASA in 1962. He worked at the Manned Spacecraft Center in Houston, Texas, until 1970. He served as the Flight Director on Gemini 11 and Gemini 12, and as one of the Flight Directors on Apollo 8, the first mission to orbit the Moon; Apollo 11, the first mission to land on the Moon; and Apollo 12, the second Moon landing mission. From 1970 to 1972 he was manager of the Earth observation satellite program. He then worked as Deputy Head of the Payload Section of the Space Shuttle program, as Deputy Director of the Johnson Space Center, and as Director of Space Operations before he retired in 1988.
 Links: a. Gemini 11 b. Houston c. Mississippi College d. Gemini 12
Output:
a