Which factor was a key reason for the economic success of the Greek city-states

Which factor was a key reason for the economic success of the Greek city-states?

A. new farming techniques

B. geographical isolation

C. war and conquest

D. a booming system of trade

D. a booming system of trade

Explanation:

One major reason for the economic success of the Greek city-states was their successful trade with other civilization.

Athens and Sparta engaged in trade with other countries, buying and selling which helped them to become economically secure and successful.

answer; ///i do believe that the correct answer for the above is ( which states would be free and which states would have check first good

ccp would be the answer : )

explanation: