The federal system and the unitary system most differ in that?
(A) the unitary systems has many different levels of government, but the federal system does not.
(B) the federal system allows citizens to vote on leaders, but the unitary system does not
(C) the unitary system gives all power to the states, but the federal system divides powers.
(D) the federal system splits power, power, but the unitary system gives most powers to the central Government.