In the following sequence $CH_3CH_2Cl$ $\xrightarrow{NaCN} (i)$ $\xrightarrow{Ni/H_2} (ii)$ $\xrightarrow{\text{acetic anhydride}} (iii)$,Product $(iii)$ is

• A
  $CH_3CH_2CH_2NH_2$
• B
  $CH_3CH_2CH_2CONHCH_3$
• C
  $CH_3CH_2CH_2NHCOCH_3$
• D
  $CH_3CH_2CH_2CONHCOCH_3$