Consider the following complexes

Their electrical conductance in aqueous solutions are
 

Conductance is directly proportional to number of ions.

thus, the higher the number of ions the higher will be the conductance.

In ${\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right] \rightleftharpoons 2{\mathrm{K}}^{+}+{\left[{\mathrm{PtCl}}_6\right]}^{2-}$ there are 3 ions.

In ${\mathrm{PtCl}}_4.2{\mathrm{NH}}_3 \rightleftharpoons \left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_4\right]$ there are no ions.

In $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]{\mathrm{Cl}}_3$ has 2 ions.

In $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]{\mathrm{Cl}}_3$ has 4 ions.

Hence, the correct option is option (A) 256, 0, 97 and 404 respectively.