Answer:
Luminosity classes are labeled with Roman numerals from I to V: I are supergiant stars, II are bright giants, III are ordinary giants, IV are subgiants, and V are ordinary main sequence stars. The complete spectral classification for a star is then given by specifying both the spectral class and the luminosity class.
Explanation:
The best summary of the excerpt is Pangu Grew
You did not include the introductory paragraph.
I think its B unless you're talking college wise then it would be C.
