Answer:
The correct answer is B. It had more fertile land.
Explanation:
A is wrong because they weren't able to use natural resources much before they developed agriculture there.
B is correct because southern Mesopotamia was much more fertile than north, and people came there and used the advantages of the land.
C is wrong because Mesopotamia was the origin civilization among the other things because this city-stated that were created there were created on a fertile soil, thanks to the irrigation and drainage system in the river valleys of Tigris and Euphrates.
D is wrong because it didn0t had natural borders. Most of the conquerors that came to Mesopotamia came from the mountain region on the North.
