Answer:
After the Tet Offensive, General Westmoreland asked for more troops (a).
Step-by-step explanation:
General William Westmoreland was the commander of US troops stationed in Vietnam during some of the years of the most intense fighting (1964-1968). He is credited with the escalation of the war and with the huge increase of American military involvement; US military personnel passed from 16,000 to over 500,000 men in 1965. Though his strategy caused heavy losses to the North Vietnamese army and the Viet Cong guerrillas, a stalemate emerged in 1967. The surprising and bold communist Tet Offensive of 1968 delivered a blow to claims of progress in the war. The general asked for 200,000 more troops, but the Johnson administration refused. Westmoreland was relieved from his commanding post in Vietnam in 1968.