Which of the following reasons explains why most early cities developed in southern Mesopotamia? A. It had many natural resources.
B. It had more fertile land.
C. It was the origin of civiliation.
D. It had natural borders for protection.

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.