The Main Source of Power Afforded to the Vice President

The main source of power afforded to the vice president derives from the

A) vice president's constitutional position as president of the Senate.
B) array of specific powers afforded the vice president by the Constitution.
C) Long-standing historical tradition of including the vice president in the president's inner circle of advisors.
D) degree of power and authority granted to the vice president by the president.
E) senatorial tradition of majority rule.