What is the diameter of a golf ball?

• A. 38 mm
• B. 43 mm
• C. 41 mm
• D. 45 mm

Answer: (B)

The size standard for golf balls is defined by the Rules of Golf: a ball must have a diameter of at least 42.67 mm (1.68 inches). In practice, golf balls are about 42–43 mm in diameter. Choosing 43 mm aligns with this typical, standardized size and is the closest to the official minimum.

38 mm is clearly too small, since it falls below the minimum. 41 mm is also below the minimum, so it wouldn’t meet the standard. 45 mm is larger than the common size range and not representative of typical golf balls.