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.
The Swiss Federal Council is elected by the 246 members of the Federal Assembly of Switzerland by secret ballot.
Spartan troops conquered the city of Messian and turned it's conquered people into non-free laborer a. The Messerians were forced to raise crops for the Spartans. This captive work force freed Spartan men from farming chores.
I believe the answer is: Bench Trial
Bench trial is could only be done if both the plaintiff and the defendant agree to pursue this trial because in general bench trial is far non-time consuming and cost friendly compared to normal method of trial. High level criminal cases could not be handled in the bench trial.