What is the diameter of a soccer ball that rolls 3.2 m and makes 13.0 revolutions?

• A. 1.8 × 10^-2 m
• B. 3.1 × 10^-2 m
• C. 7.8 × 10^-2 m
• D. 8.7 × 10^-2 m

Answer: (C)