C. To enforce ans administer federal laws is the correct answer.
Explanation:
The main function of the executive branch is to enforce laws. The executive power vests in President and he acts as the commander in chief and of the armed forces. Federal agencies enforce the laws enacted by the congress. The presidents Cabinet is also part of executive branch and is made of 15 leaders from various agencies. The president and vice president work closely with each other and the vice president takes over the leadership of untied States is President is unable to continue.
