Correct Answer: Proteins

Solution : The correct option is Protein.

Protein is essential for the formation and development of muscles, bones, and other bodily structures. It contains the essential amino acids required for the construction and repair of biological structures, making it an important part of a child's diet during their growing years. Protein deficiency can lead to diseases and conditions such as Kwashiorkor, Marasmus, edema, muscle atrophy, weakened immune system, cognitive issues, hair and skin problems, and digestive troubles. A balanced diet with sufficient protein is essential to prevent these health issues.