President thieu.

1. resigned two weeks after the paris peace accords

2. observed the cease-fire established by the paris peace accords

3. promised north vietnam billions of dollars in postwar reconstruction aid

4. counted on nixon's pledges of support to save south vietnam

4. counted on Nixon's pledges of support to save South Vietnam

Explanation:

The Paris peace agreements ending the conflict were signed on January 27, 1973, followed by the withdrawal of the remaining U.S. troops. The terms of the agreement called for a complete ceasefire in South Vietnam, enabled the North Vietnamese to retain the area they had captured, released US prisoners of war, and called on both sides to find a political solution to the conflict. To achieve lasting peace, the Saigon and Vietcong governments worked on a permanent settlement that would lead to free and democratic elections in South Vietnam. As an attraction to Thieu, Nixon offered U.S. Air Force to enforce peace conditions. With American forces left the country, South Vietnam stood alone. Although the Paris Peace Agreements were in force, the fight continued and in January 1974 Thieu publicly stated that the agreement was no longer in force. The situation worsened the following year with the fall of Richard Nixon over Watergate and the enactment of the Foreign Assistance Act of 1974 by Congress that gave up all military aid to Saigon. This act eliminated the threat of air strikes should North Vietnam break the terms of the agreement. Shortly after the passage of the act, North Vietnam launched a limited offensive to test Saigon's determination. The province fell rapidly and Hanoi pressed on the attack.

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The answer is a)advocates of divine right.