20. Rank the following complex ions in order of increasing wavelength of light absorbed: [Co(H₂O)₆]³⁺, [Co(CN)₆]³⁻, [CoI₆]³⁻, and [Co(en)₃]³⁺ (A) [Co(CN)₆]³⁻ ＜ [Co(en)₃]³⁺ ＜ [Co(H₂O)₆]³⁺ ＜ [CoI₆]³⁻ (B) [Co(CN)₆]³⁻ ＜ [CoI₆]³⁻ ＜ [Co(en)₃]³⁺ ＜ [Co(H₂O)₆]³⁺ (C) [CoI₆]³⁻ ＜ [Co(en)₃]³⁺ ＜ [Co(H₂O)₆]³⁺ ＜ [Co(CN)₆]³⁻ (D) [Co(CN)₆]³⁻ ＜ [Co(H₂O)₆]³⁺ ＜ [Co(en)₃]³⁺ ＜ [CoI₆]³⁻ (E) [CoI₆]³⁻ ＜ [Co(H₂O)₆]³⁺ ＜ [Co(en)₃]³⁺ ＜ [Co(CN)₆]³⁻