Which Statement Best Describes Slumping, a Mass Wasting Process

Which statement best describes slumping, a mass wasting process?

A) A mass of soil or regolith becomes saturated with water and suddenly flows downhill to the base of the slope.
B) The soil and regolith move downhill very slowly.
C) A block or blocks of unconsolidated regolith slide downhill along a curved slip surface.
D) Blocks of hard bedrock rapidly slide downhill along fracture surfaces.