The correct answer is - D. Materials are transported through erosion and are dropped in another location.
The process of deposition basically is a process in which the materials are left, dropped, deposited somewhere. This process needs two other processes to occur first in order for it to be possible. The first one is the weathering, the process in which the materials are broken down into smaller pieces. The second one is the erosion, the process in which the material is moved away from its initial location. Once the material is moved by certain agents (wind, water for example) it will eventually stop moving because of the loss of force of the agent. Once the agent losses its force it will not be able to carry the material anymore, thus the material will be dropped off, or rather deposited at those places.
