The correct option is C Hydrogenation of alkenes
Wilkinson's catalyst is [RhCl(PPh3)3]. Wilkinson's catalyst is used for the conversion of alkenes to alkanes.
The mechanism of this reaction involves the initial dissociation of one or two triphenylphosphine ligands to give 14- or 12-electron complexes, respectively, followed by oxidative addition of H2 to the metal.