Answer:
Command armed forces
Step-by-step explanation:
It is the President, and not Congress, who has the authority to command armed forces, as Section 2 of Article II of the U.S. Constitution states: The President shall be commander in chief of the Army and Navy of the United States, and of the militia of the several states, when called into the actual service of the United States;
The other options, on the other hand, constitute some of the Congress' powers explicitly stated in Section 8 of Article 1 of the U.S. Constitution. Part of the section states the following: "Congress shall have power (...) to lay and collect taxes, duties, imposts and excises (...) to coin money, regulate the value thereof, and of foreign coin, and fix the standard of weights and measures (...) to declare war."