15. Based on the HSAB principle, which of the following metal-ligand pairs is expected to exhibit the strongest covalent bonding character?
(A) $\mathrm{Mg^{2+}}$ with $\mathrm{F^{-}}$
(B) $\mathrm{Ag^{+}}$ with $\mathrm{I^{-}}$
(C) $\mathrm{Pt^{2+}}$ with $\mathrm{CN^{-}}$
(D) $\mathrm{Pt^{2+}}$ with $\mathrm{S^{2-}}$
(E) $\mathrm{Al^{3+}}$ with $\mathrm{OH^{-}}$

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