The correct answer is: "The area counted with the natural conditions for crop irrigation"
The emergence of agriculture and the beginning of sedentary settlements and civilizations, constituted the start of the Neolithic period of human history, and took place in the so-called Fertile Crescent, located between the Tigris and Euphrates rivers. This area counted with the natural conditions for crop irrigation, taking into account the rudimentary instruments available at the time.
Agriculture and sedentarism brought specialization and division of labor. Specialization allowed to improve the instruments and tools used for each activity and productivity was rapidly enhanced. For the first time in history, men produced more than they could consume and trade started to happen.