Which of the Following Statements About Human Skin Color Is

Which of the following statements about human skin color is NOT true?

A) Skin color varies because of differences in ultraviolet radiation between different regions of the world.
B) The amount of melanin in the skin affects the body's production of vitamin D.
C) The amount of melanin in the skin affects the body's ability to process lactose.
D) Light skin is at a selective advantage outside the tropics, because it admits ultraviolet radiation, which causes the body to manufacture vitamin D and thus prevents rickets and osteoporosis.
E) Light skin is at a selective disadvantage in the tropics, because it is more susceptible to the destruction of the folate that is needed to produce folic acid to protect against neural tube defects in human embryos.