16. Which factor most often increases $\Delta_{\mathrm{o}}$ for first-row transition metal complexes (all ligand/coordination number/structure equal)?
(A) Decreasing oxidation state
(B) Changing ligand from $\mathrm{CN^{-}}$ to $\mathrm{I^{-}}$
(C) Increasing metal oxidation state
(D) Going from $5d$ to $3d$ metal
(E) Lower coordination number always increases $\Delta_{\mathrm{o}}$

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