Concept:Denudation is the general process that lowers and levels the Earth's surface by gradual breaking and wearing away.
Explanation:Denudation involves both the disintegration of rocks and the transport of the broken materials.
Agents such as water, wind, ice, and gravity gradually wear down high areas and fill low areas.
This results in a lowering and levelling of the land surface over time.
Weathering only describes the breakdown of rocks in place, without the lowering or levelling effect.
Mass wasting refers specifically to downslope movement of material under gravity.
Relief simply describes the physical shape and height of the land.
Thus, the process described in the question is best matched by denudation.
Answer:B. Denudation