Can you edit it because the answer wont show, and ill try to answer if i know the answer
People 18 to 20 years old, regardless of property ownership
It's too dry to grow crops. People in these regions have become nomadic herders and they must move their herds to find water and grass. The people also might have to adjust to find ways to get water such as developing an irrigation system.
Answer: My guesses are...
B. Ghana lacked nearby water resources (because of the drought that was put upon them.) and E. Ghana did not have iron weapons and rival nations did.
I hope these are it and I hope that this helps you a little. Sorry if they aren't correct. I truly am sorry if they aren't. Good luck.