The correct answer is A) They developed separately.
Geographical features, including mountains and the sea, affected Greek city-states' development in that they developed separately.
The geography of Greece was definitive for the creation of many city-states. Many mountains, many islands, the sea, were important geographical features that made Greece have different city-states. In ancient times there were as many as 1,000 city-states, but the most important were Athens, Sparta, Syracuse, Thebes, Rhodes, Argos, and Egina.
