Answer:
D. They have used irrigation to carry water from rivers to crops.
Explanation:
Irrigated agriculture is widespread in North Africa, about 28% of farmlands in North Africa are irrigated. For example, Libya has the largest irrigation project in the world, called the Great Man-Made River which supplies farmlands across Libya with freshwater for cultivation.
People in North Africa essentially, irrigated farming to make their land more suitable for agriculture.
I think your best shot is probably choice A
My answer for your question is choice 3
