What Were the Consequences of the Vietnam War Outside of Southeast

What were the consequences of the Vietnam War outside of Southeast Asia?

A) It showed that the United States could be defeated, and this encouraged others to challenge the United States.
B) It made the Soviet Union feel that they could successfully create communist states in the developing world.
C) It made many in Western Europe and the United States question whether the United States was as altruistic as many had formerly believed.
D) All of the above are true.