4. If we look at night with our naked eyes, we see a mix of stars "projected" onto the bowl of the sky: bright bluish stars and faint bluish stars, as well as bright reddish stars and faint reddish stars. Select the choice below which best answers the question: Why don't the stars follow the main sequence relationship, "bluish = luminous and reddish = faint", seen so clearly on the HR diagram?

A. We do not see stars at night that are on the main sequence.
B. Magnetic fields makes the stars change their brightness.
C. The stars are all different distances away.

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