The decline of agricultural economies
Villages and towns were built around ubaid farming communities. They are known as Sumerians. They were in control of the area by 3000 B.C. Their culture was comprised of a group of city-states.
I would say its B but don't quote me
Women had to get jobs if their husbands were gone. they could do more than just stay home. Some women went to help out in world war 1 as nurses and such