Why did the United States eventually stop supporting South Africa?
A- The government began enacting socialist land reforms.
B- Popular opinion turned against South African apartheid.
C- South Africa began taking arms and funds from the Soviets.
D- The American public stopped supporting African intervention.

B- Popular opinion turned against South African apartheid.

Explanation:

American public opinion and Congress started to feel increasingly angry about the apartheid regime. In the early 1980s, there were more and more calls for sanctions against Pretoria. This forced the US Ronald Reagan administration to make a policy shift. Pressure was added after Nobel Peace Prize winner, South African  archbishop Desmond Tutu went to the United States and publicly called US policy "immoral."