Which of the following is considered a direct free kick offense?

A direct free kick offense occurs when a player commits a foul that directly leads to a free kick being awarded to the opposing team where the ball can be kicked directly into the goal without needing to touch another player first. In this context, the action of kicking an opponent is a clear foul that meets this criterion. It is a violation of the Laws of the Game that is considered to endanger the safety of the opponent and is therefore penalized with a direct free kick.

The other situations mentioned do not qualify as direct free kick offenses. For instance, being caught offside is not a foul in itself but rather a violation of the rules regarding player positioning and timing when the ball is played. Time-wasting is generally considered unsporting behavior but does not lead to a direct free kick; it may result in an indirect free kick or a caution. Similarly, excessive celebration, while it may warrant a caution, does not constitute a direct free kick offense as it is not one of the fouls that can directly result in a free kick. Therefore, kicking an opponent is the clear choice for a direct free kick offense in this scenario.