How is Young s modulus of elasticity defined?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/11/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2-1.png"><img alt="The Youngs modulus of elasticity defined - option a" class="size-full wp-image-183604" height="46" src="https://www.sanfoundry.com/wp-content/uploads/2017/11/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2-1.png" width="35"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/11/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2-2.png"><img alt="The Youngs modulus of elasticity defined - option b" class="size-full wp-image-183605" height="43" src="https://www.sanfoundry.com/wp-content/uploads/2017/11/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2-2.png" width="37"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2c.png"><img alt="The Youngs modulus of elasticity defined - option c" class="size-full wp-image-239121" height="45" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2c.png" width="41"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/11/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2-4.png"><img alt="The Youngs modulus of elasticity defined - option d" class="size-full wp-image-183607" height="41" src="https://www.sanfoundry.com/wp-content/uploads/2017/11/engineering-materials-metallurgy-questions-answers-mechanical-properties-q2-4.png" width="36"/></a>