Answer:
Most early cities developed in southern Mesopotamia because it had more fertile land.
Explanation:
A is not correct because Mesopotamia was poor in natural resources, it actually had just two primary ones, but those two were the most important at that time.
B is correct because the abundance of fertile land along the Tigris and Euphrates enabled the developement of societies, as the people were able to produce much more food than they needed and used it for trade to obtain other goods.
C is not correct because civilization was only able to develop because of the abundance of fertile land and water.
D is not correct because the natural borders don't provide conditions for the development of civilization, but just make it easier as they eliminate the threat of invasion.
