Amain sequence star cools and expands. it must be entering which stage answer white dwarf black dwarf red giant

A main sequence star cools and expands and it must be entering the stage known as red giant. The correct option among all the options that are given in the question is the last option. It is actually a luminous giant star having an intermediate weight. It is the late phase of stellar evolution. I hope the answer helps you. 

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C; skin, is the answer!