Which enolate derived from 1-phenylbutan-2-one is most stable?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9a.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option a" class="alignnone size-full wp-image-224672" height="68" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9a.png" width="166"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9b.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option b" class="alignnone size-full wp-image-224673" height="95" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9b.png" width="153"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9c.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option c" class="alignnone size-full wp-image-224674" height="70" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9c.png" width="163"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9d.png"><img alt="Enolate derived from 1-phenylbutan-2-one is most stable - option d" class="alignnone size-full wp-image-224675" height="72" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-enolates-q9d.png" width="156"/></a>