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(B) The starting material is a $\beta$-hydroxy ketone. In the presence of a base $(HO^-)$,it undergoes a retro-aldol reaction to form a diketone inter

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Retro aldol and further condensation

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(B) The starting material is a $\beta$-hydroxy ketone. In the presence of a base $(HO^-)$,it undergoes a retro-aldol reaction to form a diketone intermediate $(CH_3-CO-CH_2-CH_2-CH_2-CO-CH_3)$. This diketone then undergoes an intramolecular aldol condensation followed by dehydration to yield the final product,$3$-methylcyclohex-$2$-en-$1$-one. Thus,the correct sequence is retro-aldol followed by intramolecular aldol condensation.

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