Which player should deliver the jack at the start of the second set if player "A" wins the first set?

In the game of bowls, the established rule is that the winner of the previous set has the privilege of delivering the jack at the start of the next set. This is recognized as a way to reward the winning player for their success in the previous round. Therefore, in this scenario where player "A" has won the first set, it follows that player "A" should deliver the jack at the beginning of the second set. This practice promotes fairness and consistency within the game by allowing the victor to initiate the next phase of play.

The other options do not align with standard practice: the rule does not stipulate that the previous loser should have the first delivery or that a coin toss or umpire decision is necessary in this context. This reinforces the notion of maintaining an orderly and predictable structure in the competition.