A Medium-Mass Star Evolves into a Red Giant Because ____

A medium-mass star evolves into a red giant because ____.

A) the core expands as new fusion products collect there
B) the surface of the star becomes cooler
C) energy from hydrogen shell burning and helium fusion forces the outer layer to expand
D) the surface of the star becomes hotter
E) increased stellar winds carry large amounts of material off of the surface of the star

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