The president is commander in chief. this means that he/she is
in charge of the nation's economy
in charge of the nation's food supply
o in charge of the nation's armed forces
in charge of the nation's water supply

In charge of the nation's armed forces.

Explanation:

The president´s role as US commander-in-chief  is defined by the Constitution. In modern democracies, the military is subordinated to civil authorities. The Article 2, Section 2, of the Constitution says: "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."

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