When Examined with a Grating Spectrograph,the Discharge from Helium Gas

Multiple Choice

When examined with a grating spectrograph,the discharge from helium gas has bright radiation at a relatively few discrete wavelengths; the discharge from nitrogen gas has radiation in bands with a very large number of discrete wavelengths.What is the reason for this difference in the spectra of these two gases?

A) The atoms of the helium gas have two electrons whereas the atoms of the nitrogen gas have many electrons; therefore,the nitrogen gas gives a more complicated spectrum.
B) The nitrogen gas has molecules that have rotational and vibrational energies that produce bands of closely spaced wavelengths in the spectrum.
C) The nitrogen gas discharge is hotter,which "smears out" the wavelengths of the radiation according to Planck's law for blackbody radiation.
D) The levels of the helium atoms can be obtained from the Bohr theory of atoms,which gives a few relatively discrete allowed energies,whereas nitrogen must be described by the band theory,which gives continuous bands of allowed energies.
E) None of these is correct.