(C) Isoelectronic species are those that have the same number of electrons.For $CN^{-}$: $C(6) + N(7) + 1 = 14$ electrons.For $CO$: $C(6) + O(8) = 14$

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(C) Isoelectronic species are those that have the same number of electrons.For $CN^{-}$: $C(6) + N(7) + 1 = 14$ electrons.For $CO$: $C(6) + O(8) = 14$ electrons.Since both have $14$ electrons,they are isoelectronic.Additionally,they are isosteres because they have the same number of atoms and the same number of electrons.