If these are your possible answers:
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.
Then the correct answer is C. Mountains and islands made travel between Greek cities difficult,
while Persians built an efficient system of roads to connect their
cities.
Roads were not developed in Greece because the land was very fragmented so they used a lot of naval traveling. Persians traveled using roads because they were mostly continental and connected their cities to ease up trading.
