The Underlying Concept of the Principle of Separation of Powers

The underlying concept of the principle of separation of powers is

A) that all three branches of government are equally powerful.
B) that when legislative, judicial, and executive power are not exercised by the same institution, power cannot be so easily abused.
C) that the people are responsible to elect the representatives in all three branches of government, including the judicial branch.
D) that one branch has a veto power over the other branches.
E) that the people's power to elect representatives is separate and different from that of the branches of the government.