Design a hypothetical protein structure where proline's cyclic nature plays a critical role, and explain its impact.

• A. Proline's cyclic nature allows for increased flexibility, enhancing protein function.
• B. Proline's cyclic nature causes a kink, potentially altering protein folding and function.
• C. Proline's cyclic nature promotes hydrogen bonding, stabilizing the protein.
• D. Proline's cyclic nature increases hydrophilicity, improving protein solubility.

Answer: (B)