What Was the Kennedy Administration's Policy Toward Vietnam

What was the Kennedy administration's policy toward Vietnam?

A) He sent some 16,000 military advisers to South Vietnam and attempted to move South Vietnamese peasants into fortified villages to isolate the Vietcong.
B) He ordered American troops to protect Premier Ngo Dinh Diem from an expected military coup.
C) He withdrew American troops and negotiated with the Soviet Union to install a neutral premier.
D) He placed an embargo of the South to force Premier Ngo Dinh Diem to deliver on his promise of land reform.
E) He initiated a major bombing campaign of North Vietnam.