Which of the Following Statements Is True

Which of the following statements is true?

A) People can have energy needs that are higher or lower than the Estimated Energy Requirement.
B) People who consume less than the Tolerable Upper Intake Level of a nutrient have a high risk of developing the nutrient's toxicity disorder.
C) Nutrition scientists have established RDAs for all essential nutrients.
D) People who consume 90% of the RDA for iron regularly are likely to develop an iron deficiency.