hey y'all I just really need help with this question so if y'all didn't mind and try to help me that would be greatHELP ME PLEASE I'LL MARK YOU THE BRAINEST!!!!!!!!​

Question
Egypt's black land was caused by ______


Options:
The damaging of the Nile River
Pollution created by farmers
The deserts surrounding the nile River
Early flooding of the nile​