When is the ball in play during a corner kick?

During a corner kick, the ball is considered in play when it is kicked and clearly moves. According to the Laws of the Game, the specific moment that the ball is in play is defined as the instant the ball is kicked and moves away from the corner arc. This rule is designed to ensure that teams have the opportunity to execute their set plays effectively, and it indicates to all players on the field that the game has resumed.

The other options do not accurately describe when the ball is in play. The requirement for the referee to clear the area is purely procedural and does not impact the actual moment of play. Similarly, the ball hitting the ground does not determine its status unless it has already been kicked and moved. Lastly, while the corner arc is significant in defining the kick's location, the specific action that marks the ball as in play is its movement after being kicked.