The correct option is C Tetraamminenickel (II)- tetrachloronickelate (II)
[Ni(NH3)4]2+: tetraamminenickel (II)
[NiCl4]2−: tetrachloronickelate (II)
Since the cationic part is named first, the IUPAC name would be tetraamminenickel (II)- tetrachloronickelate (II)