A Graduate Student Has Done a Careful Analysis of the Spectrum

A graduate student has done a careful analysis of the spectrum of a star. While she has found lines from many elements, there was not a trace of the element helium in the spectra she has been analyzing. From this she can now conclude:

A) there is most likely no helium anywhere in the star
B) all the helium must be in the core of the star; there is none of it in the outer regions
C) since helium shows lines only in hot stars, this star must be relatively cool
D) since helium is the kind of element that quickly bonds with others, all the helium in this star must be in the form of molecules
E) the student was not surprised, because NO star ever shows any lines of helium