The spectrum of a hypothetical atom is shown in the figure. Three distinct spectral series are shown, with the center series corresponding to transitions to a final state of n_f=3. The indicated spectral line corresponds to the transition from an initial state of n_i=5 to the final state n_f=3.
Which of the lettered spectral lines corresponds to the transition from n_i=7 to n_f=4?
Line A
Line C
Line H
Line F
Line E