Read the following and answer the question based on it.Proteins are used by the body for energy, metabolism, gene growth and maintenance. 10 to 35 percent of the daily calorie intake should ideally consist of proteins. They are found in all cells of the body. Hair and nail are made up of a protein called keratin, having Sulphur bonds. Curlier hair has more Sulphur links. Too much intake of proteins can sometimes lead to body weight.Proteins ________

• A. Are not used by the body for any of its functions.
• B. Are required by the body in adequate quantities.
• C. Makes hair shiny, lengthy and black.
• D. Do not cause weight gain.