Answer:
A. Appointing a new Justice to the Supreme Court to fill a vacancy
Step-by-step explanation:
B, C and D statements are all functions of the Congress as outlined in Article I of the U.S. Constitution. Option A, on the other hand, is a power granted only to the President, guarantee under Article II.
Whenever there is a vacancy in the Supreme Court (whether because of retirement, resignation, death or because they have been convicted) the President is the responsible one to nominate a Justice. And once nominated, the Senate is responsible for confirming them or not. And Congress is also the only branch that can remove a Supreme Court Justice from office