The correct option is C Abundance of water
All great civilisations formed on the banks of rivers. The Egyptian Civilisation formed on the banks of the River Nile, and the Mesopotamian Civilisation formed on the banks of the rivers Tigris and Euphrates. The Indus Valley Civilisation formed on the banks of the Indus river. The rivers provided the people with an abundance of drinking water, and fertile soil to begin cultivation of food crops, which freed parts of their population from the dependence on food gathering and hunting.