Reduction of $C=O$ to $C{H}_2$ can be carried out with 

Reduction of carbonyl group is carried out with the help of hydrazine $\left({\mathrm{H}}_2\mathrm{N}-{\mathrm{NH}}_2\right)$ on heating with strong alkali like $KOH$ and solvent glycol to give saturated alkane. This reaction is known as Wolff-Kishner reduction reaction. 

${\mathrm{R}}_2\mathrm{C}=\mathrm{O}+{\mathrm{NH}}_2-\mathrm{N}{\mathrm{H}}_2\stackrel{\mathrm{KOH},▵}{\to }{\mathrm{R}}_2{\mathrm{CH}}_2+{\mathrm{N}}_2+{\mathrm{H}}_2\mathrm{O}$

Aldehyde/ketone hydrazine alkane 

Hence, the correct answer is option (C) Wolff-Kishner reduction.