$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ and $\left[\mathrm{NiCl}_4\right]^{2-}$ are diamagnetic and $\mathrm{Ni}(\mathrm{CO})_4$ is paramagnetic.
B
$\mathrm{Ni}(\mathrm{CO})_4$ and $\left[\mathrm{NiCl}_4\right]^{2-}$ are diamagnetic and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ is paramagnetic.
C
$\mathrm{Ni}(\mathrm{CO})_4$ and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ are diamagnetic and $\left[\mathrm{NiCl}_4\right]^{2-}$ is paramagnetic.
D
$\mathrm{Ni}(\mathrm{CO})_4$ is diamagnetic and $\left[\mathrm{NiCl}_4\right]^{2-}$ and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ are paramagnetic.
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