Which reaction (conversion) is Mendius reduction

1. A.
   $R\text{-CONH}_2 \xrightarrow{\text{Br}_2,\,\text{KOH(aq)},\,\Delta} R\text{-NH}_2$
2. B.
   $R\text{-NH}_2 \xrightarrow{RX\,\text{(excess)}} R_4\text{N}^+\text{X}^-$
3. C.
   $R_4\text{NX} \xrightarrow{\text{Moist Ag}_2\text{O},\,\Delta} \text{Alkene} + R_3\text{N}$
4. D.
   $R\text{-CN} \xrightarrow{\text{Na}/C_2H_5\text{OH or LiAlH}_4} R\text{-CH}_2\text{NH}_2$

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1. A.
   Amide to amine
2. B.
   Alkyl halide to amine
3. C.
   Nitroalkane to amine
4. D.
   Alkyl cyanide to amine

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