The power which is exclusive to the Senate is approving international treaties. Option B is correct.
The United States Senate is the upper chamber of the United States Congress, which along with the United States House of Representatives, the lower chamber, makes up the legislature of the United States.
Special, exclusive powers granted to the Senate include:
major presidential appointments must be confirmed by the Senate. It offers "advice and consent" to the President by a majority vote on the appointments of federal judges, ambassadors, and Cabinet positions.