What action does the umpire take when Team A taunts a player from Team B?

When Team A taunts a player from Team B, it is important for the umpire to address the situation to maintain sportsmanship and control over the game. Issuing a warning to the coach of the involved players is the correct response as it serves to reinforce the expectation of fair play and respect among players.

By giving a warning, the umpire acknowledges the inappropriate behavior without immediately escalating to more severe consequences. This approach allows the team to understand that their actions are not acceptable and provides them a chance to correct their behavior. If the taunting continues, the umpire can then take further action, such as disciplinary measures against the players or the team, in accordance with the rules and regulations of the sport.

The other actions described in the choices do not effectively address the need for immediate intervention in a situation involving unsportsmanlike conduct. Ignoring the situation would allow poor behavior to continue unchecked, while ejection of players without warning could be seen as too harsh for a first infraction. Calling for a timeout might not address the root of the problem, which is the need to promote respect and sportsmanship on the field.