The correct answer is C. To pass the control of the war to the South Vietnamese.
Vietnamese was a plan proposed by Richard M. Nixon and consisted of withdrawing US troops located in Vietnam, to return the fighting to the Vietnamese of the south. Nixon also explained the war to Laos and Cambodia.
Vietnamization was a strategy that aimed to reduce American involvement in the Vietnam War by transferring all military responsibilities to South Vietnam. The increasingly unpopular war had created deep rifts in American society.
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