Which One of the Following Statements Regarding Rock Deformation and Strength

Multiple Choice

Which one of the following statements regarding rock deformation and strength is correct?

A) Rupture and plastic deformation occur when stresses and strain rates exceed the elastic limit of a material.
B) Elastic deformation is accomplished through internal flow of material.
C) Rocks undergo plastic deformation less readily as temperatures and pressures increase.
D) When rocks are subjected to stress for long time spans, very small, plastic deformations accumulate to produce large, permanent, elastic deformations.