How does a red giant compare to a main-sequence star of the same mass?
A) The red giant has higher surface temperature and higher luminosity.
B) The red giant has higher luminosity but lower surface temperature.
C) The red giant has lower surface temperature and lower luminosity.
D) The red giant lower luminosity but higher surface temperature.
E) Both stars have the same mass and therefore have the same surface temperature and luminosity.
B) The red giant has higher luminosity but lower surface temperature.
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