An aqueous solution absorbs light primarily in the yellow, orange, and red regions of the visible spectrum.

Which ion is most likely to be present in this solution?
Fe3+(aq)\text{Fe}^{3+}(\text{aq})Fe3+(aq)
Cu2+(aq)\text{Cu}^{2+}(\text{aq})Cu2+(aq)
Co2+(aq)\text{Co}^{2+}(\text{aq})Co2+(aq)
Sc3+(aq)\text{Sc}^{3+}(\text{aq})Sc3+(aq)