C. Each city-state had its own form of government.
Step-by-step explanation:
The city-states acted as sovereign units running their own government systems. There were basically four types of governments found in Greek city-states.
They used monarchy, a government with a king/queen and uses heredity, oligarchy, a government with a few in charge, democracy, where all citizens had a voice and a vote, and lastly tyranny, where the government is ruled with an iron fist with one leader having all control.