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(D) The reaction involves the acid-catalyzed cyclization of the given hydroxy-ester. $1$. First,the ester group $(-CO_2Et)$ undergoes acid-catalyzed h

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(D) The reaction involves the acid-catalyzed cyclization of the given hydroxy-ester. $1$. First,the ester group $(-CO_2Et)$ undergoes acid-catalyzed hydrolysis in the presence of $H_2SO_4$ to form a carboxylic acid group $(-COOH)$. $2$. Subsequently,an intramolecular esterification (lactonization) occurs between the phenolic hydroxyl group (or the primary alcohol group,but here the structure favors the formation of a cyclic ester involving the primary alcohol) and the carboxylic acid group. $3$. The primary alcohol group $(-CH_2CH_2OH)$ reacts with the carboxylic acid group $(-COOH)$ to form a cyclic ester (lactone). $4$. The final product is a cyclic ester formed by the condensation of the alcohol and the acid,which is represented by option $D$.

The major product of the following reaction is

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