HCHO was treated with a reagent X. The product formed upon hydrolysis in the presence of an acid gave $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$. The reagent $\mathrm{X}$ is

• A

  alcoholic $\mathrm{KOH}$
• B

  alcoholic $\mathrm{KCN}$
• Correct answer
  C

  $\mathrm{CH}_{3} \mathrm{Mgl}$
• D

  aqueous $\mathrm{KOH}$

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