Which Is NOT an Agricultural Issue Currently Facing Africa

Which is NOT an agricultural issue currently facing Africa?

A) Some of the most common commercial crops are less well adapted to environments outside their natural range.
B) Commercial crops tend to be planted in large fields of just one crop, which leaves them vulnerable to pests.
C) The prices of commercial crops are set on the world market, which can lead to price fluctuations that leave people without enough income to survive.
D) The most common commercial crops grown in Africa are in less demand on world markets as a result of the explosion of soybean as a food staple across the world.