Science Literacy Use the Following Graphic to Answer the Next

Science Literacy Use the following graphic to answer the next questions.
-Desertification can produce drier B and C horizons.What is the most likely hypothesis for this?

A) The thick grass roots in the upper horizons take up the water before it can reach the lower horizons.
B) The grazing animals leave waste on the surface which prevents water from filtering into the lower horizons.
C) Hot fires cause the moisture to evaporate out of the soil horizons.
D) When the upper horizons are lost the lower horizons are exposed to more incoming sunlight,drying out the lower horizons.