A) By combining the apparent magnitude with the star's parallax.
B) By measuring the period of variability in the star's apparent magnitude.
C) By studying the absorption lines in the spectrum of the star.
D) By observing the angular size of the star's image in a photograph or digital image.|||parallax helps determine how far away the star is and apparent magnitude says how bright is it, so if you have a very dim star that way far away it might get a higher luminosity class than a star that is apparently brighter but much closer.
A is the best choice|||A) By combining the apparent magnitude with the star's parallax.|||C)
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