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(B) The reaction involves the acid-catalyzed dehydration of a tertiary alcohol. $1$. Protonation of the $-OH$ group occurs to form a good leaving grou

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(B) The reaction involves the acid-catalyzed dehydration of a tertiary alcohol. $1$. Protonation of the $-OH$ group occurs to form a good leaving group $(-OH_2^+)$. $2$. Loss of water generates a carbocation at the spiro-junction. $3$. Ring expansion occurs to relieve ring strain,transforming the spiro[$5.4$]decane system into a bicyclo[$4.4$.$0$]decane (decalin) system. $4$. The resulting carbocation undergoes deprotonation to form the most stable alkene,which is the tetrasubstituted alkene,$1,2,3,4,5,6,7,8$-octahydronaphthalene (or $\Delta^{9,10}$-octalin). Therefore,the major product $A$ is the bicyclo[$4.4$.$0$]dec$-1-$ene structure.

Major product $A$ is

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