Which of these is a power that the president of the united states can exercise?

Within Article II of the US Constitution, the President is given a series of powers, which are:

Command the military, including Army, Navy, and National Guard.Grant clemency, pardons, and other reprieve for offenses against the United States.
 
Handle all foreign affairs, including negotiating treaties.
Appoint ambassadors, justices, public ministers, councils, and executive officers.

Convene, or dismiss, congress at the President’s leisure.

Oversee the execution of the laws.

Sign bills, return them to congress with suggested changes, or veto them.

Recommend legislature and measures to Congress.

Has Executive Power as needed in order to fulfill the above duties.

The answer is option e.