Which of the following statement is true about Net protein Utilization?

• A. It is the ratio of total nitrogen retained by total nitrogen intake multiplied by 100
• B. It is the ratio of energy from protein to total energy diet
• C. If the NPU is high the amount of protein requirement in diet is high
• D. It is the amount of one amino acid per gram of a protein divided by the amount of same amino acid per gram of egg protein