$\begin{array}{1 1} \text{(a) It is due to the partial double bond character between the oxygen of benzene and the phenol ring, it is difficult to remove it for nucleophilic substitution reaction.} \\ \text{(b) It is due to the partial double bond character between the oxygen of -OH and the phenol ring, it is difficult to remove it for nucleophilic substitution reaction.} \\ \text{(c) It is due to the partial double bond character between the oxygen of -OH and the phenol ring, it is difficult to remove it for Electrophilic addition reaction} \\ \text{(d) None of the above} \end{array} $
