Cleisthenes Is Important in the History of Athenian Government Because

Cleisthenes is important in the history of Athenian government because he:

A) defeated Sparta in a series of brilliant naval campaigns.
B) rejected the practice of ostracism, which allowed Athenians to banish a citizen for ten years.
C) championed the cause of the demos and took steps to limit the power of aristocrats.
D) defeated Persia at the battle of Marathon.
E) championed the cause of the aristocrats and took steps to limit the power of the demos.