Which of the following descriptions about the amount of Vitamin D intake is true?
A. The upper limit of Vitamin D intake for adults is 400 lUs.
B. It is dangerous for adults to take 2,000 lUs Vitamin D daily.
C. An overdose of Vitamin D does not necessarily result in diseases.
D. For people under 50, it is safe to take 200 lUs Vitamin D daily.