What is a feature of vitamin D synthesis?
A) Tanning lamps and tanning booths do not stimulate vitamin D synthesis.
B) Sunscreens with sunburn protection factors of 2 and above prevent synthesis of vitamin D.
C) The ultraviolet rays of the sun are able to easily pierce heavy clouds and smog to promote vitamin D synthesis.
D) Dark-skinned people require longer sunlight exposure than light-skinned people to synthesize equivalent amounts of vitamin D.
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