Refer to the Figure Showing a Soil Profile

Refer to the figure showing a soil profile. Years of cotton farming in the South have stripped away much of the A horizon of the soils.Subsequent agriculture has

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