Researchers agree that currently there is an over-screening for vitamin D deficiency, and overtreating of healthy people who are getting enough vitamin D through diet and sun exposure. They believe that from an evolutionary standpoint, it doesn’t make sense that higher vitamin D levels would be beneficial to humans. Vitamin D is hard to find in naturally occurring food sources and though we can get vitamin D from the sun, our bodies evolved to create darker skin in the parts of the world that get the most sun. If vitamin D were so critical to humans, then they would not have evolved in this way, to require something that is hard to come by and then evolve in such a way as to make it harder to utilize.
Which of the following is most strongly supported by the information given in the passage?
A. Most people get sufficient vitamin D from naturally occurring food sources and exposure to sunlight.
B. Higher than required vitamin D levels could have a harmful effect on the human body.
C. Majority of the lighter-skinned people live in parts of the world that get the least sun.
D. Having darker skin reduces the ability of the body to absorb vitamin D from exposure to the sun.
E. The sole purpose of human evolution is to help humans live an easier and healthier life.