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(B) The reaction involves the acid-catalyzed dehydration of $1$-isopropylcyclopentanol. $1$. Protonation of the $-OH$ group followed by the loss of $H

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(B) The reaction involves the acid-catalyzed dehydration of $1$-isopropylcyclopentanol. $1$. Protonation of the $-OH$ group followed by the loss of $H_2O$ generates a secondary carbocation at the $1$-position of the cyclopentane ring. $2$. $A$ $1,2-H^-$ shift occurs to form a more stable tertiary carbocation on the isopropyl group. $3$. Ring expansion occurs to relieve ring strain,converting the five-membered ring into a six-membered ring (cyclohexyl carbocation). $4$. $A$ $1,2-CH_3^-$ shift then occurs to form a more stable tertiary carbocation. $5$. Finally,deprotonation leads to the formation of the most stable alkene,which is $2,3$-dimethylcyclohexene.

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