What are the size and weight specifications for a jack on outdoor non-synthetic greens?

The specifications for the jack used on outdoor non-synthetic greens are defined by World Bowls regulations, which stipulate that the diameter must be between 63 mm to 64 mm, and the weight must be in the range of 225 g to 285 g.

Option B accurately reflects these standards, making it the correct choice. This specific range ensures consistency and fairness in the game, as all players must play with a jack that meets these requirements. Such standardization is essential for ensuring a level playing field in tournaments and competitions around the world.

Other choices do not conform to the established regulations, which is why they are not correct. For instance, options with sizes or weights outside these parameters would not be acceptable for official play, as they could affect gameplay and the overall integrity of the sport.