Answer :
The office of the vice president was left vacant over 15 times, 18 to be exact, because there were no formal procedures for naming someone to assume the office.
The correct option is D
The vice president of the United States is the person with the second highest position in the executive branch of the Government, after the president of the United States. The Vice President exercises the Presidency definitively when the president dies, resigns or is removed from office for a trial. Eight vice presidents have assumed the presidency because of the death of the president, and one - Gerald Ford - because of the resignation. John C. Calhoun and Spiro Agnew have been the only vice-presidents who have resigned their office.
