The correct options are
A [Cu(NH3)4][PtCl4]
C [Co(NH3)6][Cr(C2O4)3]
[Cu(NH3)4][PtCl4] can show coordination isomerism because NH3 and Cl can interchange the coordination sphere. Also, [Co(NH3)6][Cr(C2O4)3] can show coordination isomerism as NH3 and C2O4 can interchange the coordination sphere.