A bed load includes large and small particles are found mixed in a fast-moving stream. The correct option is D.
What is a bed load?
The descriptor bed load or bedload refers to particulate in a flowing fluid basically water that are carried anywhere along stream bed. Bed load works in tandem with suspended load and wash load.
Conventionally, parameters of bedload have been taken by placing samplers in contact with the bed and permitting the sediment transferred as bedload to accrue (or be trapped) inside the sampler for a certain amount of time before raising the sampler to the surface and emptying the material.
Once the critical boundary shear stress is exceeded, coarser grained material tends to move in intermittent contact with the bed.
This movement, known colloquially as "bedload transport,"
Thus, the correct option is D.
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