The process in which sediment is laid down is called a. erosion. c. weathering. b. deposition. d. cementation.

Im thinking erosion or cementation  bc if u really think about it 
Erosion is the process by which the surface of the Earth gets worn down. Erosion can be caused by natural elements such as wind and glacial ice.
The key to erosion is something called "fluid flow." Water, air, and even ice are fluids because they tend to flow from one place to another due to the force of gravity. Of the three, liquid water is the most common agent of erosion because there's so much of it on the surface of the Earth. or maby it could be cementation but most likely cementation
hope it helped