The floodwaters of the tigris and euphrates deposit silt on the land in mesopotamia. what effect did this have on the area? a. it made the land unsuitable for growing crops b. people wanted to move away from the region c. it was easier to grow crops there d. it increased the amount of rainfall the area received

The spread of river silt across Mesopotamian lands made the region much more fertile. This had a huge impact on the region and even on the development of human civilization: the people in Mesopotamia were able to grow crops, and thus stay put and feed themselves without needing to travel about. Agriculture was a key factor in the great civilizations that emerged from the region. 

The answer is C: it was easier to grow crops there