Which of the Following Is True of Carotenoids

Which of the following is true of carotenoids?

A) They are artificially synthesized vitamins that are required by the body in large doses.
B) They are enzymes involved in the formation and maintenance of the protein collagen.
C) They are a group of highly unstable molecules that damage polyunsaturated lipids in cell membranes.
D) They are members of a group of pigments in foods that range from light yellow to reddish orange in color.
E) They are molecules with one or more unpaired electrons that make the molecule highly unstable.