A Massive Blue-White Supergiant Star Emits the Hα Wavelength from Its

Multiple Choice

A massive blue-white supergiant star emits the Hα wavelength from its surface,as does a much less massive red dwarf.Will these wavelengths differ when you see them? If so,how?

A) The light from the more massive star will have the shorter wavelength.
B) The light from the less massive star will have the shorter wavelength.
C) Both wavelengths will appear the same, and this will also match the wavelength of an Hα source here on Earth.
D) Both wavelengths will appear the same, but both will be longer than the wavelength from an Hα source here on Earth.