Which behavior is least effective in handling passenger conflict?

Returning aggression with aggression is least effective in handling passenger conflict because it escalates the situation rather than resolving it. When a driver responds to a passenger's anger or frustration with similar aggression, it can lead to heightened emotions, misunderstandings, and possibly even confrontations. This approach undermines the opportunity for effective communication, can exacerbate the conflict, and ultimately makes it difficult to reach any resolution. In contrast, actively listening, remaining calm, and seeking an amicable resolution are strategies that foster understanding and support constructive dialogue, which are essential for de-escalating conflict and promoting a positive interaction.