Tina is consuming 15 mg of iron per day. Her RDA is 18 mg. She has no condition warranting a greater-than-normal need for iron. Which of the following statements is true about her consumption of this nutrient?

A. She is likely to be deficient in iron.
B. She will need to consume significantly more iron, above the RDA, to make up for her intake.
C. Only if her intake is consistently less than 70% of the RDA would she be at great risk of nutritional deficiency.
D. She couldn't possibly be getting enough iron for her needs