The correct answer to this question is B, Folding. Denudation deals with the Earth's surface. It levels and lowers the surface and does so by breaking away features of the Earth. Weathering occurs when rocks are disintegrated by chemical, physical, and biological processes.
Erosion occurs when the surface of the Earth wears away by agents like rain, wind, and waves. The last agent is Mass wasting, which is caused by gravity. It occurs when sand and rocks move downslope. Many factors cause denudation, including activities by people on Earth, the way Earth is structured, and local climate conditions.