Which of the following is a true statement regarding the genetics of blind cavefish?

• A. A special genetic mutation gives blind cavefish immunity to specific illnesses.
• B. Blind cavefish have fewer genetic mutations than normal-vision fish.
• C. Blind cavefish have evolved genetic adaptations that allow them to navigate in complete darkness.
• D. Blind cavefish have the same genetic makeup as their sighted counterparts.