When You Get a Suntan,why Does It Soon Fade Away

When you get a suntan,why does it soon fade away if you do not consistently spend time in the sun?

A) The melanin breaks down if not kept warm
B) The melanin is absorbed at a constant rate and you have to build it up faster than it is absorbed
C) "Tanned" cells are eventually sloughed off (although melanin is produced in living stem cells that continue to divide,half the melanin is lost into each daughter cell that dies and is pushed to the surface)
D) Sunlight suppresses the lighter skin pigments and they can again return to mask the melanin
E) Ultraviolet radiation destroys melanin

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