Concept:Displacement is a psychological defense mechanism where a person redirects their emotions, especially negative ones like anger or frustration, from the original source to a less threatening target.Explanation:The teacher is experiencing stress due to difficulties with colleagues. Instead of confronting them, the teacher expresses this stress by misbehaving or showing anger towards students in the classroom. This is an example of displacement because the teacher is shifting their negative feelings from the actual source (colleagues) to a safer, less powerful target (students).Answer:B. Displacement