Answer:
A/ Communist Party
Explanation:
During the Cold War, there were periods of great tension between the United States and the Soviet Union, the two world superpowers at the time. This was also an ideological battle, between capitalism, represented by the U.S., and communism, represented by the Soviet Union.
This is why the House of Representatives had a committee, the HUAC, focused solely on detecting possible communist activity in domestic territory. This committee was similar to the one led by Joseph McCarthy in the Senate (The Senate Government Operations Committee).
