What accomplishment of the early Mesopotamian cultures resulted in a long-term solution to seasonal climate changes?. Single choice. A supplying water to fields with dams and canals

B building retaining walls around the entire farming settlement

C settling farther from the rivers to prevent damage to homes and fields

D growing a surplus of food

Option: A. supplying water to fields with dams and canals.
Explanation:
The Mesopotamia economy was based on agriculture. They focused on the cultivation of cereals (barley). Because of the harsh climate, the arid soil and little rain, there was a requirement for large scale irrigation through dams and canals. Canals built to bring the water for the fields to grow crops. Canal also divert water direction, which limits the damage from floods.