Correct Option: A

Protein is a vital part of a healthy diet for children. This substance, though important for all people, is especially necessary for developing and growing bodies. Protein is used as a source of energy, especially when carbohydrates and fats are at insufficient levels in the diet. In addition, a child needs adequate protein to support the body’s production of its own proteins. The manufactured proteins are used in strength maintenance, development of muscles and connective tissues, transportation of oxygen to all areas of the body and antibody production to fight infections.