Landslides, mudflows, slump, and creep are all examples of
a. mechanical weathering.
b. runoff.
c. mass movement.
d. soil formation.

Landslides, mudflows, slump, and creep are all examples of "mass movement".

Mass movement which is also known as mass wasting or slope movement, is the geomorphic procedure by which soil, sand, regolith, and stones move downslope commonly as a strong, persistent or spasmodic mass, to a great extent under the power of gravity, however every now and again with qualities of a stream as in debris flow and mudflows. Flows happen when the material, soil, as well as rocks, carry on more like a fluid or liquid.

answer; (true);