Red giant is the type of star which is in spectral class K and has a luminosity of 106 and is denoted as option D.
What is a Star?
This refers to an astronomical object which contains plasma which is luminous thereby producing light with the aid of its internal energy sources present.
Stars are bound by gravity and are of different types such as Class K, Class M etc. Red giant is the type of star which falls under the category of class K and has a luminosity of 106.
This is therefore the reason why Red giant was chosen as the most appropriate choice.
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