In the following reaction ' $\mathrm{C}$ ' is an aromatic compound having substituents $D \& E$. What are $D \& E$ ?

• A

  $-\mathrm{OH},-\mathrm{SO}_3 \mathrm{H}$
• B

  $-\mathrm{CHO},-\mathrm{NO}_2$
• Correct answer
  C

  $-\mathrm{COOH},-\mathrm{NO}_2$
• D

  $-\mathrm{SO}_3 \mathrm{H},-\mathrm{NO}_2$

Hence, the correct answer is option: 'C'.