When the nile river flooded every june, what was left behind when the water receded that allowed the civilization to flourish?

Fields that were watered and able to sustain the life of crops that the people would need to eat to survive.  Plz mark brainlest if right!

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

c or d both can be the answer