C.
Deposition
Step-by-step explanation:
As observed by the illustration it who winds carrying individuals particles of soil displacing them from one location to another. This is wind erosion. Only particles small enough to be carried by the winds are blown away leaving the area with very thin topsoil.
As observable from the illustration, the process between C & D is the process of deposition, The individual's particles carried by the wind are being deposited and are accumulating/ building up into a pile. This occurs when the wind encounters an obstacle that breaks the wind and causing it to drop the particles it is carrying.