The correct option is C Stephen's reaction
The reaction RCNSnCl2/HCl−−−−−−−→[R−CH=NH2]+Cl−H2O−−→RCHO+NH4Cl is known as Stephen's reaction .
It involves the preparation of aldehydes (R−CHO) from nitriles (R−CN) using tin(II) chloride (SnCl2), hydrochloric acid (HCl) and quenching the resulting iminium salt ([R−CH=NH2]+Cl−) with water (H2O).