Stress is the force that is applied to the rock. When the pressure is applied parallel but in opposite direction, is referred as shearing.
The force that causes deformation of a material by slippage along planes that are parallel to the imposed stress.
The resultant shear is very important in nature as it relates the down-slope movement of Earth material and to earthquake.
Shear stress occurs when a rock mass is pushed in parallel but in opposite direction.
Thus, the correct option is C.
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