Answer:
D. issuing a signing statement
Explanation:
It is widely known that Presidents can grant pardons. Nixon was granted Pardon by President Gerald Ford. Jimmy Carter granted amnesty to draft dodgers (for the Vietnam War), so it is another thing that a president can do.
Amnesty is another power that the executive branch has. This has been used by the President before, as President Jimmy Carter granted amnesty to draft dodgers for the Vietnam War.
So, if the president can do those two things, it means that a president can issue a reprieve for a sentence.
Leaving us with the only possible answer, <em><u>Option D</u></em>.