The scenario that best illustrates how the power to make treaties in the United States Constitution provides for checks and balances among the three branches of government is D) The Senate must approve a treaty by a two-thirds vote, and its terms must be found to be constitutional by the Supreme Court.
Explanation: The Constitution of the United States establishes the system of checks and balances between the three branches of government to prevent any one branch from becoming too powerful. The power to make treaties is a power given to the President of the United States, with the advice and consent of the Senate. The Senate must approve a treaty by a two-thirds vote, which puts a check on the power of the President to negotiate treaties. Additionally, the Supreme Court is responsible for interpreting the Constitution, so it must ensure that the terms of the treaty are constitutional. If the Supreme Court rules that the treaty violates the Constitution, then it cannot go into effect, providing another check on the power of the executive branch.