Which of the following coordination complexes contains a neutral ligand?

  • A
    $[Fe(CO)_5]$ (Pentacarbonyliron$(0)$)
  • B
    $[Fe(CN)_6]^{4-}$ (Hexacyanoferrate$(II)$ ion)
  • C
    $[Co(C_2O_4)_3]^{3-}$ (Trioxalatocobaltate$(III)$ ion)
  • D
    $Na_3[Co(NO_2)_6]$ (Sodium hexanitrocobaltate$(III)$)

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