Answer:
It provided a sturdy foundation for homes people had to control where it was deposited to ensure its supply ( B )
Step-by-step explanation:
Mesopotamia were having an overwhelming supply of silt been deposited on the banks of the river every year by the flood that brings waters to the banks. this silt were very rich and fertile for agriculture.
The availability of silt was very important for homes and the people had to control where it was deposited in order for it not to obstruct man-made irrigation system. Mesopotamia is in the middle east which means most farms were irrigated by man-made systems. the silt helped the farmers who used them to produce good agricultural produces.