Marginal Rangeland Becomes Desert and Farmland Loses It Productivity as a Result

Marginal rangeland becomes desert and farmland loses it productivity as a result of lost topsoil.Which of the following is a main cause of topsoil loss?

A) Strong winds and rain on bare soil, causes erosion along with the use of large farming machines.
B) Farmers plant too many crops on smaller pieces of land.
C) Excessive animal grazing on land that results in loss of vegetation and therefore topsoil.
D) The use of fertilizers along with the use of large farming equipment leads to topsoil losses.
E) The accumulation of mineral salts and the evaporation of excess irrigation water are leading causes of the loss of topsoil.