Which Recent Discovery Has Led Archaeologists to Question the Old

Which recent discovery has led archaeologists to question the old idea that complex societies arose in Mesopotamia in order to organize labor on irrigation projects?

A) That Mesopotamian societies did not actually coordinate labor on such a scale.
B) That complex societies appeared at the same time in nearby areas with agriculture sustained by rainfall.
C) That irrigation was not as important to Mesopotamian societies as previously thought.
D) That agriculture is less important than bureaucracy in sustaining a complex civilization.
E) None of these.