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(C) The reaction is a Pinacol-pinacolone rearrangement,where a diol is converted into a carbonyl compound in the presence of an acid catalyst $(H^+)$.

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(C) The reaction is a Pinacol-pinacolone rearrangement,where a diol is converted into a carbonyl compound in the presence of an acid catalyst $(H^+)$.$1$. Protonation of one of the hydroxyl groups occurs,followed by the loss of a water molecule to form a carbocation.$2$. The initial carbocation is on a four-membered ring,which is highly strained.$3$. To minimize ring strain,the ring undergoes expansion from a four-membered ring to a more stable five-membered ring.$4$. The resulting carbocation is then stabilized by the lone pair of the remaining hydroxyl group,forming a resonance-stabilized oxonium ion.$5$. Finally,deprotonation yields the stable ketone product,$2,2$-dimethylcyclopentanone.

The major product of the following reaction is

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