Concept: Denudation is the process that lowers and levels the Earth's surface by gradual breaking and wearing away.
Explanation: Denudation involves the wearing down and smoothing of landforms over time.
It includes weathering, erosion, and mass wasting working together through agents such as water, wind, and ice.
Weathering only breaks rocks in place, but denudation also removes and levels the surface material.
Mass wasting is a separate process of downslope movement, not general levelling.
Relief simply describes the shape and height of the land.
Therefore, the correct term for lowering and levelling the Earth's surface is denudation.
Answer: B. Denudation