Which of the following reaction is feasible?

Reaction in (a) is not feasible because replacement of $-\mathrm{OH}$ by $-\mathrm{Cl}$ is not possible for phenol due to partial $\mathrm{C}=\mathrm{O}$ bond and resonance stabilization. Reaction is (c) is not feasible because $\mathrm{KMnO}_4$ is a strong oxidizing agent and converts $-\mathrm{C}-\mathrm{OH}$ to $-\mathrm{COOH}$. Reaction in (d) is not feasible because $20 \% \mathrm{PO}_4$ is not a strong enough dehydrating agent and therefore $85 \% \mathrm{~h}_3\mathrm{PO}_4$ is used.