Concerning declarations of war, the A. power to declare war rests with the president only. B. National Security Council votes to declare war. C....

The answer to this question can be found in Clause 11 of Section 8 in Article I of the Constitution of the United States.  That clause says that one of the powers that Congress has is the power “to declare War.”  When the Constitution says that, it means that the Congress does not have to share that power with any other group or person.

The Framers of the Constitution did not want the president to have too much power.  They worried that a president who was too strong would become more like a king or tyrant.  Therefore, they did not give the president the power to declare war.  They wanted war to be declared only if there was strong support for war in the country.  For this reason, the Constitution gives Congress alone the power to declare war.