(B) The starting material $A$ is a cyclic acetal containing an aldehyde group. In the presence of an acid catalyst $(H^+)$,the cyclic acetal undergoes

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(B) The starting material $A$ is a cyclic acetal containing an aldehyde group. In the presence of an acid catalyst $(H^+)$,the cyclic acetal undergoes hydrolysis to release the original aldehyde and ethylene glycol. The resulting product $B$ is an isomer of $A$ that contains both a ketone and an aldehyde group,which is a keto-aldehyde.