Defoliants were used in Vietnam primarily to a. destroy military bases. b. expose enemy hiding places and destroy food supplies. c. poison the Vietcong. d. destroy homes.

Defoliants destroy plant life, or cause leaves to fall off trees. The most commonly used one in the Vietnam war was known as Agent Orange. This chemical was primarily used during Operation Ranch Hand, for the purpose of exposing enemy hiding places and destroying food supplies. Your answer would be B.