In part, the defeat of the United States in Vietnam in the 1970s resulted from
a. the general superiority of the Viet Cong as soldiers.
b. the greater loss of American than Vietnamese lives.
c. inadequate air power resulting in the use of chemical weapons.
d. Vietnamese belief that the communists were fighting for independence.
e. an insufficient commitment by the U.S. government to win the war.
Answer: D