Answer:
It's B. Only the Supreme Court can do that.
Explanation:
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The role of the President pro tempore of the Senate is mostly ceremonial as he is appointed to work in the place of a vice president when he is not available and take everything in control.
Mostly the power is in the hands of the other leaders and the senators but in the absence of the vice president the President pro tempore of the senate takes his place and certain duties are authorised which he can perform during that time.
The Great plains, not sure why honestly.
If your teacher selects you to speak on behalf of your class to the principal you are a "representative" of your class, in the sense that you are bringing the opinions of the whole class with you.