The Expansion of Vice Presidential Power Illustrates What Key Institutional

The expansion of vice presidential power illustrates what key institutional fact of American political life?

A) The Framers of the Constitution clearly believed that the president and the vice president were to be equal.
B) The vagueness of the language in the Constitution created opportunities for vice presidents to expand their power.
C) The language of the Constitution is decidedly unambiguous with respect to executive branch authority.
D) The Framers of the Constitution had a precise understanding of how the office of the vice presidency would evolve over time.