In the transformation of 4-hydroxy-2-butanone to 4-hydroxybutane (reduction of carbonyl to methylene), which of the following is the most appropriate reagent?

The reduction of $>\text{C=O}$ to $-{\text{CH}}_2-$ can be done by Clemmensen ($\text{Zn-Hg}/\text{HCl}$) or Wolff-Kishner (${\text{NH}}_2{\text{NH}}_2/\text{KOH}$).However, the molecule contains an $-\text{OH}$ group (alcohol).Clemmensen reduction uses strong acid ($\text{HCl}$), which would cause substitution of the $-\text{OH}$ group with $-\text{Cl}$.Wolff-Kishner reduction uses basic conditions, which does not affect the alcohol group. Therefore, Wolff-Kishner is the most appropriate reagent.${\text{NaBH}}_4$ would only reduce the ketone to an alcohol, not to a methylene group.