Answer:
D) The annual flooding of the Nile river.
Step-by-step explanation:
The Nile is a major north-flowing river in northeastern Africa and the longest river in Africa, it covers eleven countries and is the primary source of Egypt and Sudan.
The ancient Egyptian civilization was bound to the Nile and its accurately seasonal flooding. The predictability of the river allowed the Egyptians to build an empire with a basis on its agriculture.
I hope this answer helps you.