Which equation represents Rosenmund reduction

1. A.
   Structure (a)
2. B.
   $\text{R-CN}\xrightarrow{\text{SnCl}_2,\text{HCl}/\text{H}_2\text{O}}\text{R-CHO}+\text{NH}_4\text{Cl}$
3. C.
   $\text{R-CHO}\xrightarrow{\text{Zn-Hg}/\text{Conc. HCl}}\text{RCH}_3$
4. D.
   Structure (d)

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1. A.
   $\mathrm{R - CO - Cl \xrightarrow[Pd - BaSO_4]{H_2} R - CHO + HCl}$
2. B.
   $\mathrm{R - CN \xrightarrow[H_3O^+]{SnCl_2, HCl} R - CHO + NH_4Cl}$
3. C.
   $\mathrm{R - CHO \xrightarrow[\Delta]{Zn - Hg\ conc.HCl} R - CH_3 + H_2O}$
4. D.
   $\mathrm{R - CO - R \xrightarrow[\text{ii) KOH, HO}-CH_2-CH_2-OH,\ \Delta]{\text{i) }H_2N - NH_2} R - CH_2 - R}$

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