(C) The ligand $CO$ is a neutral ligand with a charge of $0$.Let the oxidation state of $Ni$ be $x$.For the complex $[Ni(CO)_4]$,the sum of oxidation

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(C) The ligand $CO$ is a neutral ligand with a charge of $0$.Let the oxidation state of $Ni$ be $x$.For the complex $[Ni(CO)_4]$,the sum of oxidation states equals the total charge of the complex,which is $0$.$x + 4(0) = 0$$x = 0$Therefore,the oxidation state of $Ni$ in $[Ni(CO)_4]$ is $0$.