The complex compound, ${\left({\mathrm{Ph}}_3\mathrm{P}\right)}_3\mathrm{RhCl}$ is considered as example of

The complex compound, ${\left({\mathrm{Ph}}_3\mathrm{P}\right)}_3\mathrm{RhCl}$ is considered as example of Wilkinson's Catalyst. $\left[\mathrm{Rh}{\left({\mathrm{Ph}}_3\mathrm{P}\right)}_3\right]\mathrm{Cl}$is employed to hydrogenate alkenes. Rhodium can reduce alkenes with precision by forming a 6-coordinate complex. The Wilkinson's catalyst selectively reduces the least-hindered double bond while being unable to reduce double bonds or carbon-oxygen double bonds.

Therefore, (B) Wilkinsons catalyst is the right response.