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(C) The reaction involves the electrophilic addition of $HCl$ to vinylcyclobutane. When $HCl$ adds to the double bond,the proton $(H^+)$ attacks the t

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Chlorocyclohexane

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(C) The reaction involves the electrophilic addition of $HCl$ to vinylcyclobutane. When $HCl$ adds to the double bond,the proton $(H^+)$ attacks the terminal carbon of the vinyl group to form a secondary carbocation at the carbon adjacent to the cyclobutane ring. This secondary carbocation is unstable due to ring strain and undergoes a ring expansion rearrangement to form a more stable tertiary carbocation (a cyclohexyl cation). Finally,the chloride ion $(Cl^-)$ attacks this tertiary carbocation to form $1$-chlorocyclohexane as the major product.

The product $(B)$ is

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