Respuesta :
The sentence that used the word luxury should be the third option where the full nine hours of sleep is termed to be the real luxury.
What is real luxury?
Real luxury should not be related to luxury brands, It is basically truly exclusive & excessive. With respect to the products, here the real luxury should be a few pieces. So as per the given situation, if we get the full nine hours of sleep should be a real luxury. It can't consider the other options.
Hence, the third option is correct.
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