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(B) The reaction sequence is as follows:$1$. The starting material is a keto-ester. The ketone group is more reactive toward nucleophilic attack than

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(B) The reaction sequence is as follows:$1$. The starting material is a keto-ester. The ketone group is more reactive toward nucleophilic attack than the ester group.$2$. Treatment with ethylene glycol $(HO-CH_2-CH_2-OH)$ in the presence of an acid catalyst $(H^+)$ selectively protects the ketone as a cyclic acetal (Product $A$).$3$. Subsequent reduction with $LiAlH_4$ reduces the ester group to a primary alcohol (Product $B$).$4$. Finally,acid-catalyzed hydrolysis $(H_3O^+)$ removes the acetal protecting group to regenerate the ketone,yielding the final product $C$.

Product $C$ is

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