Shannon has considered herself an extremely healthy person for most of her life. She is a marathon runner and watches her diet very carefully. She has 8% body fat, weighs 105 pounds, and is 5 foot 10 inches tall. Why might Shannon's health still be of concern?
A) She is overweight for her height. B) She likely has metabolic problems associated with high blood pressure. C) She doesn't have enough body fat for menstruation or pregnancy. D) She doesn't consume enough nutrients for normal bodily functions.