The president is responsible for

a. selecting the new state governors.
b. creating rules for congress to follow.
c. making sure the laws are carried out.
d. approving senate office appointments.

C. Making sure the laws are carried out.

Explanation:

The President, as head of the Executive Branch, has as main duty to make sure the laws enacted by the Congress are carried out, and in order to accomplish such task, he relies on several executive agencies that expertise in different matters, such as the Departments of Agriculture, Commerce, Defense, Education, Energy, Health and Human Services, Homeland Security, Housing and Urban Development, Interior, Justice, Labor, State, Transportation, Treasury and the Department of Veteran's Affairs.

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