Which of the following best describes the difference between the way that geography affected greek and persia civilizations during the classical era?

a. access to the open sea left greece vulnerable to attacks, while the persian empire developed with very little military conflict.

b. the isolation caused by mountains and islands in greece led to a strong central government, while persia developed independent city-states.

c. mountains and islands made travel between greek cities difficult, while persians built an efficient system of roads to connect their cities.

d. greeks had an abundance of food and fresh water available, which led to population growth, while persians suffered from a harsh climate and little rainfall.