Answer: Irrigation
Explanation:
You included no options (unless there weren't any to begin with) but irrigation should be the answer.
Irrigation is a method of watering plants that involves controlling the amount of water that goes into a farm in a given period. It works by channelling water from a water source like rivers and wells and then directing it to farms.
People built canals from the Tigris and the Euphrates that channelled water to their farms thus enabling them to use the two rivers to water their crops. The ancient Egyptians did the same with the Nile.
