According to the Textbook, Which of the Following Has NOT

According to the textbook, which of the following has NOT been well understood by Western (American and European) advisers and aid officials concerning indigenous African agriculture?

A) Men produce most of the food for family consumption.
B) Indigenous practices are less sustainable than Western techniques.
C) Traditional systems are more complex than suggested systems assume.
D) With fertilizer, African soils can remain fertile under continuous use.