Answer:
C. The Vietnam war
Step-by-step explanation:
Gulf of Tonkin Resolution refers to the incident that marked the beginning of the United States’ formal involvement in the Vietnam war.
Ngo Dinh Diem was a politician and the president of South Vietnam who was assassinated during a military coup, an event that led to political chaos and the subsequent further involvement of the United States in the Vietnam War.
Tet Offensive is the official name of the invasion of over a hundred major cities in South Vietnam by North Vietnam, to damage the United States and South Vietnamese forces.