What Is One Way the Chinese Civil War Proved Significant

What is one way the Chinese civil war proved significant for the cold war?

A) It reassured Truman that the scope of the cold war was diminishing because communism had not proved a major issue between the fighting Chinese factions.
B) It led the U.S. military to intervene immediately and demonstrated the strong support Americans showed early on for such a massive intervention.
C) It resulted in the victory of Communists over Chinese Nationalists, and the Communists would go on to intervene in the Korean War to aid their North Korean allies.
D) It ended with the Chinese Nationalists' victory over the Communists because of their detonation of the first atomic weapons since the Second World War.
E) It led to an alliance between the U.S. government and the Communist Chinese government, for their version of communism was much different than the Soviet Union's.