未分类题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.