James Breasted's Fertile Crescent Hypothesis Assumes That __________

James Breasted's Fertile Crescent hypothesis assumes that __________.

A) the low fertility of the Mesopotamian floodplain and the Nile Valley was a secondary cause for the appearance of cities and states in these regions
B) larger grain consumption resulted from increased agricultural efficiency
C) smaller grain surpluses resulted from social changes
D) the extra food supported non-food producers, such as artisans, priests, and traders who were the backbone of state-organized societies