Final Answer:
b. Kennedy was increasing the number of American military advisers.
Step-by-step explanation:
In South Vietnam in the early 1960s, option (b) is accurate. During this period, President John F. Kennedy increased the number of American military advisers in South Vietnam to assist the government of President Ngo Dinh Diem in its fight against the Viet Cong insurgency. The commitment of military advisers was part of the United States' efforts to support South Vietnam in its struggle against the Communist insurgency.
This move marked an escalation of U.S. involvement in the region, laying the groundwork for further American engagement in the Vietnam War. It was characterized by the presence of military advisers and support rather than the direct involvement of large numbers of American troops in combat.
Thus the correct option is B