Aniline on treatment with $NaNO_2 / HCl$ at about $0^\circ C$ gives a compound $A$, which on further treatment with $CuCN / KCN$ gives a compound $B$, which when reacts with $H_2 / Ni$ gives a compound $C$. The compound $C$ on reaction with $HNO_2$ gives a compound $D$. The structure of $D$ is:

• A
  $C_6H_5CH_2OH$
• B
  $C_6H_5NHCH_2CH_3$
• C
  $C_6H_5NHOH$
• D
  $C_6H_5CH_2NH_2$