Which of the following conversions requires the reagent $Sn / HCl$?
- A$R-CONH_2 \rightarrow R-CH_2-NH_2$
- B$R-C \equiv N \rightarrow R-CH_2-NH_2$
- C$R-NO_2 \rightarrow R-NH_2 + 2H_2O$
- D$R-CONH_2 \rightarrow R-NH_2$
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