The correct option is D Stunting of growth, discoloration of hair and mentalapathy
Proteins are composed of molecules called as amino acids and each amino
acid contains four elements hydrogen, oxygen, nitrogen and carbon. Protein deficiency in the body can be identified by a number of symptoms which differ from age to age. The centres for disease control and prevention reports that children
under the age of 5 are most susceptible to protein deficiency. The symptoms of this include growth retardation, decreased musculature, discolouration of hair and significant lack of energy.