Which of the Following Describes How Iron Deficiency Affects Children's

Which of the following describes how iron deficiency affects children's behavior? 

A)  It affects brain function long before blood effects appear. 
B)  Testing is a tedious, cost-prohibitive process for many families. 
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.