The correct comparison regarding how Mesopotamians altered their environment in relation to Egyptians developing basin irrigation is A. The Mesopotamians used a series of crisscrossing channels.
Mesopotamians developed an intricate system of canals and channels to manage the water from the Tigris and Euphrates rivers, which allowed them to irrigate their crops effectively in their arid environment. This method was distinct from the basin irrigation used by Egyptians, which involved the creation of basins to catch and hold water during the annual flood of the Nile River.