The correct option is C Tetraamminenickel(II)-tetrachloronickelate(II)
[Ni(NH3)4][NiCl4]
Here, 4 chlorido ions are present. Since nickel shows an oxidation state of 0 and +2, the anion could have a -4 or -2 charge respectively.
We can easily rule out the -4 charge if we look at the cation. NH3 is a neutral ligand and since nickel shows oxidation states of +2 and 0, the cation cannot possibly have a +4 charge to balance out the -4 charge on the anion.
Hence, both the anion and cation must have nickel in its +2 state. Now the rest is simple and the name would be: Tetraamminenickel(II) tetrachloridonickelate(II).