PLEASE HELP ASAP!!!!!!

Each of the following factors was a reason for Sargon’s conquest of Sumer except __________.
A.
Mesopotamia had no defensible borders
B.
the Sumerian city-states had become divided
C.
kingdoms were fighting over natural resources
D.
the Akkadians were able to hide in the mountains


Please select the best answer from the choices provided

A
B
C
D