Question

Which action can Congress not preform, according to the Constitution?

This answer is CORRECT
Appointing a new justice to the Supreme Court to fill a vacancy

Answer 1

appointing a new justice to supreme court to fill a vacancy

Answer 2

Yes, your answer is correct as confirmed. It is not the job of the legislative to appoint a new justice to the Supreme Court but the power of the executive branch itself, most specifically the President. The main role of the Congress to make laws, and decides on state matter that cannot be done by the President alone.