C. Each city-state had its own form of government
Ancient Greece was made up of independent city-states, known as polis, such as Athens, Sparta, and Corinth. Each city-state operated like a small country with its own government, laws, military, and currency.
So, rather than being unified under one government or social structure, each city-state was politically independent, which is why option C is correct.
The other options are incorrect because: