Reason for the deformation of a regular body

• The only thing that linear, lateral, and bulk strain change is the body's dimension.
• For instance, due to the applied pressure, linear strain alters the length of the body, lateral strain alters the breadth of the body, and bulk strain alters the radius of the body (sphere).
• However, shear strain changes the body's shape and is the cause of its deformation.

Hence the correct answer is shearing strain.