Reaction of aniline with $\mathrm{NaNO}_{2}+$ dil. HCl at $0^{\circ} \mathrm{C}$ followed by reaction with $\mathrm{CuCN}$ yields.

• A

  I
• B

  II
• Correct answer
  C

  III
• D

  IV

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