How were the motivations behind the Korean War and the Vietnam War similar?

A. Both wars grew in scale when the United States intervened to stop communist groups from taking control of the government.

B. Both wars grew out of revolts by working-class and poor citizens during the economic depression following World War II.

C. Both wars were fought in Asian territory, but most of the soldiers who were killed in the fighting were European and American.

D. Both wars began as rebellions against oppressive European colonial policies and grew into enormous nationalist civil wars.

The answer is A. When the US entered the war in order to stop the spread of communism, the war grew by the intervention from both Russia and China.

A. Both wars grew in scale when the United States intervened to stop communist groups from taking control of the government.

Explanation:

The Korean War and the Vietnam War were similar in that they both began as a Cold War conflict between communism and capitalism. This is the reason why the wars interested several countries, particularly the United States. These wars are considered "proxy wars" because the real conflict beneath the surface was between the Soviet Union and the United States. When the United States intervened in order to fight against the communists, both wars grew in scale, becoming a lot more deadly and a lot more difficult to solve.