The correct option is D Denudation of soil cover and its washing down
Soil erosion can be defined as the denudation of the soil cover and subsequent washing down of soil. Some causes of soil erosion are human activities like deforestation, overgrazing, construction and mining, or natural forces like wind, glaciers and water. Soil erosion results in loss of land fertility, increase in pollution, clogs waterways, flooding, and sedimentation in rivers.