How do the federal system and the unitary system most differ?
A. The unitary system 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 powers to the states, but the federal system divides powers.
D. The federal system splits powers, but the unitary system gives most powers to the central government.