The correct option is A Chlorotris (triphenylphosphine) rhodium (I)
The IUPAC name of the wilkinson's catalyst [RhCl(PPh3)3] is chlorotris(triphenylphosphine)rhodium(I) because the oxidation state of Rh metal in the complex is x + (-1 x 1) + 0 = 0, implies x = + 1. hence the correct option is A.