Which of the following slope failures is most likely to cause large numbers of casualties?

A) creep
B) debris slide
C) earth flow
D) rotational slide
E) rock avalanche

Rock Avalanche

High-velocity, turbulent flow of rock, sediment, and soil that results from the collapse of a steep mountain front.

Debris Slide

The downslope movement of soil, weathered sediment, or other unconsolidated material, partly as a sliding, coherent mass and partly by internal shearing and flow.

Rotational Slide

A type of landslide involving the rotational movement of rock or soil along a curved surface, typically caused by the undercutting of a slope or the saturation of soil.