20. There are three aqueous solutions of the complex ions: [Co(NH₃)₆]³⁺, [Co(CN)₆]³⁻ and [CoF₆]³⁻. The wavelengths of absorbed light for these solutions are 770 nm, 440 nm, and 290 nm. Please match the complex ion to the wavelength of absorbed light.
(A)[Co(NH₃)₆]³⁺: 770 nm; [Co(CN)₆]³⁻: 440 nm; [CoF₆]³⁻: 290 nm.
(B)[Co(NH₃)₆]³⁺: 440 nm; [Co(CN)₆]³⁻: 290 nm; [CoF₆]³⁻: 770 nm.
(C)[Co(NH₃)₆]³⁺: 290 nm; [Co(CN)₆]³⁻: 440 nm; [CoF₆]³⁻: 770 nm.
(D)[Co(NH₃)₆]³⁺: 440 nm; [Co(CN)₆]³⁻: 770 nm; [CoF₆]³⁻: 290 nm.

(E)[Co(NH₃)₆]³⁺: 290 nm; [Co(CN)₆]³⁻: 770 nm; [CoF₆]³⁻: 440 nm.