Hmmm I believe it is colloquialism and social context !! if not I'll update my answer !!
A stays the same because everything else makes no sense
Saying both the choices out loud, got is the only one that makes grammatically correct sense.
Hope this helps!
Answer:
The moon
Explanation:
The Decision to Go to the Moon: President John F. Kennedy's May 25, 1961 Speech before Congress. On May 25, 1961, President John F. Kennedy announced before a special joint session of Congress the dramatic and ambitious goal of sending an American safely to the Moon before the end of the decade.