When a player is on the putting green, they cannot touch another player’s putter without incurring a penalty?

When a player is on the putting green, they must adhere to specific rules regarding the conduct of play, including the interactions with equipment. Touching another player’s putter is generally not permitted because it can lead to potential undue influence or interference in the game. The rule is designed to maintain the integrity of play on the putting green, ensuring that players are solely responsible for their equipment and the actions related to it. Therefore, violating this rule results in a penalty.

Option B does not recognize the restriction on touching another player's putter. Option C incorrectly suggests that there are exceptions based on the ball being in play, while D implies different rules for competition versus casual play, which is not the case in this context. Thus, touching another player's putter while on the putting green incurs a penalty, affirming that the initial statement is true.