Answer: D. The United States provided support to anti-communists.
Explanation: What is communism?
Communism can be defined as a series of philosophical, political, social organization and economical ideologies that advocates for the complete elimination of private ownership of properties, while supporting a profit-based economy with public ownership of the means of production in a country.
What is the Vietnam War?
The Vietnam War is sometimes referred to as the Vietnam conflict or the Second Indochina War and it can be defined as a short, costly, protracted and divisive conflict between the communist government of North Vietnam and South Vietnam, which ended on the 30th of April, 1975.
Generally speaking, the United states of America provided a significant level of support to anti-communists during the conflicts that occurred in Turkey, Greece, Korea, and Vietnam (Vietnam War).