Which factor directly influenced the different types of government that formed in greece and persia during the classical era?

a. the persian empire was warlike, while the greek city-states rarely fought against their neighbors.
b. the people of persia were much wealthier and better educated than the greeks.
c. the mountains and islands of greece led to city-states that were more isolated than persian cities.
d. the greek city-state system created a need for a stronger central government than the persian imperial system.