Early Mesopotamians turned to dry farming because . A.
the scratch plough broke up the soil
B.
seasonal floods made the land fertile
C.
the amount of rainfall supported the crops
D.
irrigation systems provided water from the rivers

Hey, I believe it is D)  irrigation systems provided water from the rivers

Explanation:

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answer; ///( insanity );

answer; with few regulations protected the prices of crops which made farmers leave their farms and migrate to the big cities to work in factories;