The Four Lines Observed in the Visible Emission Spectrum of Hydrogen

The four lines observed in the visible emission spectrum of hydrogen tell us that:

A) The hydrogen molecules they came from have the formula H₄.
B) We could observe more lines if we had a stronger prism.
C) There are four electrons in an excited hydrogen atom.
D) Only certain energies are allowed for the electron in a hydrogen atom.
E) The spectrum is continuous.