What Was the Biggest Difference Between Dark Age Greece and Later

What was the biggest difference between Dark Age Greece and later Greek city-states?

A) City-states traded less than Dark Age Greece.
B) Warfare with and raiding of other communities did not occur in the Dark Age.
C) The city-states used iron tools and weapons.
D) During the city-state period, the importance of powerful families increased.
E) Formal institutions of government, such as legislative bodies, grew during the city-state period.