In 2007 the Institute of Medicine Revised Its DRIs for Vitamin

In 2007 the Institute of Medicine revised its DRIs for vitamin D and issued new RDAs for the vitamin.Why did some scientists disagree with the new recommendations?

A) the literature on vitamin D and cancer was ignored.
B) calcium absorption can be improved at intakes higher than those recommended
C) 90% of Canadians had levels of vitamin D in the blood at or above the recommended levels for an adequate intake
D) Both a & b