Which of the Following Statements Is True of Iron Intake

Which of the following statements is true of iron intake by the body?

A) After age 20, healthy males require more iron intake than do females.
B) The recommended dietary allowance (RDA) for iron should be between 10 and 18 mg.
C) Strict vegetarians are less likely to develop a dietary deficiency of iron.
D) The amount of iron in the body is maintained at a relatively constant level between 15 and 20 g