Africa Has 22 Percent of the Earth's Land Surface and 10.5

Africa has 22 percent of the earth's land surface and 10.5 percent of the world's population. Why does Africa still have famines?

A) Because of outmoded farming techniques and political instability
B) Because there are too many children and not enough adults to help farm the land
C) Because there are not enough people farming the land
D) Because of totalitarian governments and too many people
E) Because there are too many people living on the land