Which of the following best explains why the U. S. did not send troops to South East Asia to stop the genocide of the Khmer Rouge in Cambodia?
a. Public support for sending troops back into SE Asia did not exist due to the U. S. experience in Vietnam.
b. The Khmer Rouge were not communist, so the U. S. did not see their take over of Cambodia in 1975 as a threat.
c. The Khmer Rouge were allied with the United States against the Viet Cong.
d. The War Powers Act forbid the introduction of U. S. troops back into SE Asia.