Which of the Following Explains Why Clay-Rich Soils Are Less

Which of the following explains why clay-rich soils are less permeable than sandy soils?

A) clay particles are electrically charged and very small.
B) clay soils have greater porosity.
C) sandy soils have greater vegetation cover.
D) sandy soils tend to form in areas with abundant rainfall.
E) pores spaces of clay soils become plugged with sand grains.