Which of the Following Describes a Slump

Which of the following describes a slump?

A) Rocks break off of cliffs and fall to the base of a slope.
B) Rocks and soil move downslope very slowly.
C) Rapid downslope movement of snow and ice, sometimes with the addition of rock, soil, and vegetation
D) Blocks of rock break off and move together, sliding along a curved path.
E) Mud becomes saturated with water and flows quickly into a streambed.