(C) The compound is $2,5$-cyclohexadienone. The nucleophile $CH_3O^{-}$ can attack at the carbonyl carbon (direct addition) or at the $\beta$-carbon a

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(C) The compound is $2,5$-cyclohexadienone. The nucleophile $CH_3O^{-}$ can attack at the carbonyl carbon (direct addition) or at the $\beta$-carbon atoms of the conjugated system (conjugate addition). There are two equivalent $\beta$-carbon positions and one carbonyl carbon position,making a total of $3$ potential sites for nucleophilic attack.