The correct answer is A) the Vice President.
The Vice President breaks a tie vote in the Senate.
The Vice president of the United States presides over the Senate or the Upper chamber of Congress. Â However, he is not allowed to vote in the sessions. The only time he can cast its vote is when he needs to break a tie. If for any reason the vice president of the United States can preside over a session, the one in charge of the Senate is the president pro tempore.