An ambident ligand is:

C O

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C N^{-}

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C O_{2}

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H_{2} O

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Solution

The correct option is B $C N^{-}$
Ambidentate ligand is the one which has multiple possible donor sites but will donate through only one of the site in $C N^{-}$ , electrons are present on carbon as well as on nitrogen, making it ambidentate.
$C O$ has electron density only on carbon, since making bond with oxygen will increase its octet. Hence it is not possible.
$C O_{2}$ and $H_{2} O$ both have electron availability on oxygen only.

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