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    The answer is C but what about A??
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    a star more massive than the sun in its main sequence would have a higher temperature + luminosity (it'd be in the top left on the main sequence group on a h-r diagram), so A can't be true

    to explain a lil more, a more massive star will have a greater gravitational pull and therefore need to compensate with more reactions in their core to create more energy (so temp is higher). Temp and luminosity are proportional, so you're gonna find that particular star further left + towards the top of the H-R diagram than you would the Sun. A star in its main sequence could not be more massive than the Sun with a lower temp, it's not possible

    hope it helps x
 
 
 
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