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(B) The reaction involves the acid-catalyzed cyclization of a polyene alcohol. In the presence of $H_3O^+$,the hydroxyl group is protonated and leaves

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(B) The reaction involves the acid-catalyzed cyclization of a polyene alcohol. In the presence of $H_3O^+$,the hydroxyl group is protonated and leaves as $H_2O$,generating a carbocation. This carbocation then undergoes a series of intramolecular electrophilic additions (cyclization) to form the polycyclic structure. The mechanism involves the formation of the steroid-like skeleton through successive ring closures. The final product $(A)$ corresponds to the structure shown in option $(B)$.

Product $(A)$ of the reaction is

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