How is the critical length or a composite material defined?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3a.png"><img alt="The critical length or a composite material defined - option a" class="size-full wp-image-239172" height="64" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3a.png" width="82"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3b.png"><img alt="The critical length or a composite material defined - option b" class="size-full wp-image-239173" height="62" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3b.png" width="91"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3c.png"><img alt="The critical length or a composite material defined - option c" class="size-full wp-image-239174" height="61" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3c.png" width="83"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3d.png"><img alt="The critical length or a composite material defined - option d" class="size-full wp-image-239175" height="44" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-mcqs-q3d.png" width="89"/></a>