Answer:
A. Communism was not contained in Vietnam.
Step-by-step explanation:
The US withdrew its forces from Vietnam in 1973. By 1975, Saigon, the capital of South Vietnam, fell to the North Vietnamese communist forces. South Vietnam unconditionally surrendered to North Vietnam on April 30, 1975. All of Vietnam became united under communist control.
There were also successful communist invasions of Laos and Cambodia also