Which of the Following Is a Characteristic of Iron Deficiency

Which of the following is a characteristic of iron deficiency in children?

A) It affects brain function before anemia sets in.
B) It rarely develops in those with high intakes of milk.
C) It is the primary factor in tension-fatigue syndrome.
D) Mild deficiency enhances mental performance by lowering physical activity level, thereby leading to increased attention span.
E) Children who had iron deficiency as infants recover completely when iron levels are normalized.