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(D) The reaction involves the acid-catalyzed dehydration of $1$-hydroxybicyclo[$4.4$.$0$]decane (decalol). $H_2SO_4$ protonates the hydroxyl group, fo

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(D) The reaction involves the acid-catalyzed dehydration of $1$-hydroxybicyclo[$4.4$.$0$]decane (decalol). $H_2SO_4$ protonates the hydroxyl group, forming a good leaving group $(-OH_2^+)$. Loss of water generates a carbocation at the bridgehead position. According to Bredt's rule, a double bond at the bridgehead of a small bicyclic system is unstable. However, in a decalin system (bicyclo[$4.4$.$0$]decane), the double bond can form at the bridgehead position (forming $\Delta^{1,6}$-octalin or bicyclo[$4.4$.$0$]dec-$1$$(6)$-ene) as it is the most substituted and stable alkene isomer (Zaitsev's rule). Thus, the major product is bicyclo[$4.4$.$0$]dec-$1$$(6)$-ene.

The major product $A$ is:

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