The geometry of ${\mathrm{FeCl}}_4^{2-},{\mathrm{FeCl}}_2{\left({\mathrm{PPh}}_3\right)}_2$  and ${\mathrm{AuCl}}_4^{-}$ would be respectively.

The geometry of   ${\mathrm{FeCl}}_4^{2-},{\mathrm{FeCl}}_2{\left({\mathrm{PPh}}_3\right)}_2$  and ${\mathrm{AuCl}}_4^{-}$  would be Tetrahedral, tetrahedral and square planar.

respectively.

Hence, option C is correct.