Health agencies promote moderate sun exposure as a means of generating vitamin D, an essential nutrient. The promotion is grounded in solid biochemistry. Recent epidemiology, however, suggests that the same exposures large enough to maintain vitamin D in many populations are also large enough to noticeably elevate skin cancer risk over a lifetime, complicating the public health calculus.
Which choice best describes the function of the third sentence in the text?
- A
It rejects the role of vitamin D in health.
- B
It restates the second sentence.
- C
It defines the term 'vitamin D'.
- Dcheck_circle
It complicates the public health recommendation by introducing an offsetting cancer risk.
Explanation
The third sentence introduces an offsetting cost that complicates the recommendation. B captures this complicating function.