The relation between modulus of riser and modulus extension factor is __________

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4a.png"><img alt="Relation between modulus of riser &amp; modulus extension factor is Mr` = 1.2/f - option a" class="size-full wp-image-239494" height="35" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4a.png" width="80"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4b.png"><img alt="Relation between modulus of riser &amp; modulus extension factor is Mr` = 1.2/f - option b" class="size-full wp-image-239495" height="42" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4b.png" width="81"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4c.png"><img alt="Relation between modulus of riser &amp; modulus extension factor is Mr` = 1.2/f - option c" class="size-full wp-image-239496" height="41" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4c.png" width="76"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4d.png"><img alt="Relation between modulus of riser &amp; modulus extension factor is Mr` = 1.2/f - option d" class="size-full wp-image-239497" height="33" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-pattern-design-q4d.png" width="74"/></a>