I know an answer is A for sure but i forget the others. A is an answer though.
The greeks are surrounded by sea, making it easier for them to built fort-based city. This type of city organization of course couldn't be done by the persians that's surrounded by desert. Hope This Helps!
Answer:
The Mississippi River is the main river transportation system in the nation, and back in the Civil War, this river was even more important for transportation.
Explanation:
The North could now transport troops and supplies deep into the center of the Confederacy.
I would say B monotheism and C writing system not yet deciphered
hope this helps