What is the diameter of a tennis ball?

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Multiple Choice

What is the diameter of a tennis ball?

Explanation:
The main idea is knowing the standard size of a tennis ball. A tennis ball is standardized to have a diameter between about 6.54 cm and 6.86 cm (roughly 65.4 to 68.6 mm). This keeps the ball's feel and bounce consistent across play. The option of 66 mm falls right in that accepted range, making it the correct choice. The other sizes are outside the official limits: 40 mm is far too small, 90 mm is larger than allowed, and 200 mm is far too large to be a tennis ball.

The main idea is knowing the standard size of a tennis ball. A tennis ball is standardized to have a diameter between about 6.54 cm and 6.86 cm (roughly 65.4 to 68.6 mm). This keeps the ball's feel and bounce consistent across play. The option of 66 mm falls right in that accepted range, making it the correct choice. The other sizes are outside the official limits: 40 mm is far too small, 90 mm is larger than allowed, and 200 mm is far too large to be a tennis ball.

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