How did the government of Egypt change the natural state of the Nile River?

AThey constructed the Aswan Dam to eliminate seasonal flooding.
BThey diverted the river to Cairo to increase the city’s water supply.
CThey increased the size of the floodplain to increase agricultural yields.
DThey constructed chinampas along the river to increase arable land.

Verified Answer :

"c. They increased the size of the floodplain to increase agricultural yields" is the best option from the list, since the Nile provides crucial water to plans and domesticated animals nearby. 

Answer:

They increased the size of the floodplain to increase agricultural yields.