When is the ball considered in play during a kick-off?

When considering the starting point of play during a kick-off, the correct understanding is that the ball is in play as soon as it is kicked and clearly moves forward. This means that the key factor is not merely a backward motion but the action of kicking itself, which initiates the game.

A ball is officially in play when it is kicked and complies with the expected movement. In the context of a kick-off, it's important to know that the ball must move into the opponent's half to be considered in play. Thus, the correct answer emphasizes the action of the kick, which is foundational to the restart of the game after a goal is scored or at the start of each half.

Choices that focus on when the ball is touched by a player, when the referee signals, or when it crosses the center line do not accurately reflect the specific rules governing kick-offs. While those factors may be associated with the overall play, they do not pinpoint the exact moment the ball transitions to being in play specifically during a kick-off.