Which of the following is a sending-off offense that results in a red card?

Spitting is classified as a sending-off offense that results in a red card because it is considered a serious act of misconduct. The Laws of the Game recognize spitting at an opponent or any other person as a violent conduct, which exemplifies a disregard for the principles of sportsmanship and respect essential in soccer. This behavior not only negatively impacts the integrity of the game but also poses a threat to the players involved. Hence, any player guilty of this act will usually be shown a red card and dismissed from the match to ensure the safety and respect within the sport.