The correct option is D all of these
Fe3+ reacts with CNS− to form blood red coloured complex ferric thiocyanate Fe(CNS)3.
Fe3+ reacts with [Fe(CN)6]4− to form purssian blue complex ferric ferrocyanide
Fe4[Fe(CN)6]3.
Fe3+ reacts with CH3COO− to form red coloured complex iron (III) aceta