The correct answer is C.
<em>The Vice President of the United States</em> is the second highest officer in the executive branch of the U.S. government, right after the President. His duties include:
- He serves as the President of Senate ( presides over Senate deliberations but may only vote to break a tie ).
- He fulfills additional roles dictated by the President ( serves as ceremonial assistant to the President and he is a part of the President's administration.
- He replaces the President in case of impeachment, death, disability or resignation ( becomes Acting President if any of these above happens ).
The Vice President <em>does not serve as the Speaker of the House</em> of Representative because he is the presiding officer at the Senate.