D. the Euphrates River Valley
Explanation:
The Fertile Crescent is the name for the region spreading from the Middle East to the part of Egypt and North Africa. The name comes from the fact that the region is shaped like the crescent, and that it was the cradle of farming in the times of ancient civilizations. It was in these parts that the civilizations of Sumer in Mesopotamia and Egypt blossomed and started domesticating crops and plants.
The region includes –
valley of the Nile in Egyptthe modern-day Palestine and Israelmodern-day Lebanonmodern-day Syriamodern-day Iraqthe southeast region of TurkeyTherefore, it includes the valley of the river Euphrates as well, as it flows through Iraq and Syria, and it is the place where civilizations of Mesopotamia were developed.
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