In which of the following coordination entities the magnitude of $\Delta $o (CFSE in octahedral field) will be maximum? (At. No. Co = 27)

Question

In which of the following coordination entities the magnitude of $\Delta $_o (CFSE in octahedral field) will be maximum?
(At. No. Co = 27)

[Co(CN)₆]^3$-$

[Co(C₂O₄)₃]3^$-$

[Co(H₂O)₆]³⁺

[Co(NH₃)₆]³⁺

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