The correct answer is C) to declare war.
The power that is not given to the President by the Constitution is to declare war.
The Constitution of the United States has not the power of declaring war. That power belongs to the United States Congress. This is part of the separation of powers of the federal government under the system of checks and balances. The President is the Head of the State, the Chief diplomat, and the Commander-in-Chief of the Armed Forces.
