Why Does the Star Bellatrix in Orion Looks Bluish to the Naked

Multiple Choice

Why does the star Bellatrix in Orion looks bluish to the naked eye?

A) The spectrum of light emitted from Bellatrix peaks in the blue region of the spectrum, and in fact, almost all its light is concentrated in the blue region of the spectrum.
B) The spectrum of light emitted from Bellatrix peaks in the ultraviolet region of the spectrum. Within the visible part of the spectrum, there is more emission in the blue than in any other color.
C) Bellatrix is moving toward Earth rapidly enough that its light appears appreciably blueshifted.
D) Bellatrix is made of blue material.