Why is it important to determine the amino acid composition before selecting reagents for further protein sequencing?

• A. To increase the solubility of the protein in the sequencing buffer.
• B. To confirm the protein's molecular weight before sequencing.
• C. To ensure that the protein is fully denatured before sequencing.
• D. To strategically select reagents that will target specific amino acids for cleavage.

Answer: (D)