How does a material typically respond on a stress-strain curve in relation to the proportional limit?

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When the stress exceeds the proportional limit, the material exhibits plastic behavior; below this limit, it behaves elastically.The material behaves elastically above the proportional limit and shows plastic behavior below it.Both statements A and B are true.Neither statement A nor B is accurate.

Explanation

A material behaves elastically up to the proportional limit, meaning it will return to its original shape after the load is removed. Beyond the proportional limit, the material undergoes plastic deformation, causing permanent changes in shape.