The correct answer is A) Flooding created fertile soil that was good for growing crops.
Explaining the Climate of the Fertile Crescent.
The climate of the Fertile Crescent supported early settlements in that "Flooding created fertile soil that was good for growing crops."
That is why ancient civilizations such as the Sumerians could grow and prosper.
Historians consider that Sumeria was the first civilization on planet erath. They settled in the middle of two important rivers, the Euphrates and Tigres, in modern-day Iraq, in the Middle East. There, due to the fertile soil left by the flooding of the rivers, they could grow crops and establish important city-states such as Lagash, Nippur, Kish, Ur, and Uruk.