To Create the Above Spectra, Which of the Following Is

Multiple Choice

To create the above spectra, which of the following is NOT true

A) A dense gas is excited and the light produced is over all wavelengths.
B) A low-density gas is excited and the light produced is over discrete wavelengths.
C) Light from a low-density gas passes through a warm, dense gas and the light that is produced is at all wavelengths except for a few discrete wavelengths.
D) All of the other choices are not true.