Which of the following curve is absolute for effect of % of hardness on martensite produced?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13a.png"><img alt="The curve absolute for effect of % of hardness on martensite produced - option a" class="alignnone size-full wp-image-222344" height="181" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13a.png" width="209"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13b.png"><img alt="The curve absolute for effect of % of hardness on martensite produced - option b" class="alignnone size-full wp-image-222345" height="173" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13b.png" width="203"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13c.png"><img alt="The curve absolute for effect of % of hardness on martensite produced - option c" class="alignnone size-full wp-image-222346" height="164" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13c.png" width="188"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13d.png"><img alt="The curve absolute for effect of % of hardness on martensite produced - option d" class="alignnone size-full wp-image-222347" height="180" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/casting-questions-answers-mold-materials-q13d.png" width="210"/></a>