Which of the following is Stephen reaction?
- A$R-COCl \xrightarrow[Pd-BaSO_4]{H_2} R-CHO + HCl$
- B$R-CN \xrightarrow[ii) H_3O^+]{i) SnCl_2, HCl} R-CHO + NH_4Cl$
- C$R-CHO \xrightarrow[\Delta]{Zn-Hg, \text{ conc. } HCl} R-CH_3 + H_2O$
- D$R-CHO \xrightarrow[ii) KOH, HO-CH_2-CH_2-OH]{i) H_2N-NH_2} R-CH_2-R$
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