I honestly think that a or d would be the best options. I would start with D and if that doesn't work try a.
<span>The minimal amount of nutrients needed every day by healthy people to prevent nutrient deficiencies is called the RDA.
RDA stands for recommended dietary allowances. </span>RDA's are established by the Food and
Nutrition Board of the National Academy of Sciences. There is a term RDI related to this. RDI stands for recommended daily intake.
<span>Having standard written research protocols is the correct answer. ;)</span>
