Which deficiency will most likely impair a child s growth, mood, attention span, focus, and ability to learn?
a. iron
b. sodium
c. vitamin c
d. vitamin a

The answer is letter A. 

Iron is an important nutrient that builds the composition of blood. It is necessary for the delivery of oxygen through different parts of the body. Enzyme productions also depend on the supply of iron and it is crucial in the total development of children who are growing and developing hormones, neurotransmitters, and new cells within their body. If iron stores are low, memory, mood, attention span, and focus are among the effects of the deficiency because oxygen transport in the blood is lessened or diminished. Iron comes from different sources of food and we cannot produce this type of mineral in our body on our own.