The cease-fire that ended the Vietnam War stated that Americans had to return Communist prisoners of war.
Communists had to withdraw their forces from South Vietnam.
both parties had to respect South Vietnam's right to self-determination.
the United States could not add troops to its existing forces in South Vietnam.

C; both parties had to respect South Vietnam’s right to self-determination.

Explanation:

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(It was the communists that had to return their prisoners, and Vietnam that could not add troops. America was the one who withdrew their troops.)

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explanation: