How can the analysis of DNP derivatives using HPLC help determine the number of subunits in a protein?

• A. The number of distinct DNP peaks corresponds to the number of subunits.
• B. The retention time of DNP peaks indicates the number of subunits.
• C. The presence of DNP peaks indicates the protein is monomeric.
• D. The total peak area indicates the number of subunits.

Answer: (A)