Read the excerpt from the Gulf of Tonkin Resolution. "...These attacks are part of a deliberate and systematic campaign of aggression that the Communist regime in North Vietnam has been waging against its neighbors and the nations joined with them in the collective defense of their freedom...”

Gulf of Tonkin Resolution, 1964

Based on this excerpt, what can be concluded about the attitude of the US toward the war?

A. Expansion of North Vietnam would not be prevented by armed defense.
B. There was more foreign support for North Vietnam than South Vietnam.
C. The inaction of South Vietnam’s allies was a threat to the country’s freedom.
D. Domino theory made politicians fear the spread of communism in South Vietnam.