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Explanation

As a material is plastically deformed, dislocations within the structure of the material move and become entangled. This causes the strength of the material to increase as the amount of plastic deformation is increased, which is called strain hardening, or work hardening.

Of the four engineering stress-strain curves shown, only Material A is exhibiting this behavior, as evidenced by the fact that the load required to deform the test piece increases with increasing strain.