$Cr ^{3+}=62\,pm$ radius
$Mn ^{+3}=65\, pm$ radius
$Fe ^{+3}=65\, pm$ radius
So, $Cr ^{3+}$ has highest tendency to attract ligand.
$A.$ $\left[ Fe ( CN )_6\right]^{3-}$;$B.$ $\left[ FeF _6\right]^{3-}$; $C.$ $\left[ CoF _6\right]^{3-}$; $D.$ $\left[ Cr (\text { oxalate })_3\right]^{3-}$; $E.$ $\left[ Ni ( CO )_4\right]$
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