The correct answer is A. saltation.
Saltation is the process by which sediment particles are moved by wind or water. The particles are lifted into the air and then fall back to the ground, bouncing and rolling along the surface. This process can transport large amounts of sediment over long distances.
B. Suspension is the process by which sediment particles are carried in a fluid, such as water or air. The particles are too small to settle out of the fluid, and they are transported along with the fluid.
C. Traction is the process by which sediment particles are moved along the ground by a force, such as gravity or wind. The particles are in contact with the ground, and they are moved along by the force.
D. Solution is the process by which a substance is dissolved in a solvent. The substance is broken down into its individual molecules, and these molecules are then mixed with the solvent.