17. Three separate solutions of [M(H₂O)₆]²⁺ complexes (M= Fe, Ni, and Cu) were mislabeled. In order to identify them, UV-Vis spectra were taken. Solution A has three ligand field bands. Solution B and C have only one band. Upon addition of excess CN^-, the single band of Solution B shifts to higher energy while that of Solution C becomes multiband. Which of the following is correct?
(A) M=Fe for Solution C
(B) M=Ni for Solution B
(C)M=Cu for Solution A
(D) M=Cu for Solution C
(E) M=Ni for Solution A