What is the maximum allowable width for a ditch in lawn bowls?

The maximum allowable width for a ditch in lawn bowls is indeed 380 mm. This measurement is established in the official rules governing the game, which dictate that the width of the ditch must be consistent to ensure it meets the standard regulations set for play. A ditch that exceeds this width could potentially lead to irregular playing conditions and affect the outcome of the game, as players might encounter an unfair advantage or disadvantage based on its size.

Choosing 380 mm as the correct answer reflects an understanding of the importance of uniformity in competitive play. It maintains the integrity of the sport by ensuring that all players face the same challenges regarding the playing surface. Other options, while they may seem plausible, do not adhere to the specified regulations, thereby not providing a suitable standard for the game.