As a Red Giant Evolves, Its Temperature Decreases but Its

As a red giant evolves, its temperature decreases but its luminosity increases. As a white dwarf ages, its temperature decreases, and its luminosity also decreases. Why this difference?

A) A red giant experiences nuclear fusion on its surface while a white dwarf no longer experiences fusion.
B) A white dwarf expels much soot, and this blocks its increasing luminosity from being seen.
C) A red giant expands greatly as it cools, but a white dwarf shrinks as it cools.
D) A red giant expands greatly as it cools. Because of degeneracy pressure, a white dwarf maintains the same size as it cools.

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