Years of Cotton Farming in the South Have Stripped Away

Years of cotton farming in the South have stripped away much of the A horizon of the soils. Subsequent agriculture

A) has been problematic, because the A horizon contains the most available nutrients.
B) has not been affected, because the B horizon contains significantly more available nutrients.
C) has been affected slightly, because the C horizon is most conducive to root growth.
D) has been problematic, because stripping of the A horizon leaches the C horizon of its nutrients.
E) All of the above