A nurse at a college campus mental health counseling center is caring for a student who just failed an examination. The student spends the session berating the teacher and the course. The nurse should recognize this behavior as which of the following defense mechanisms?

The correct answer is B: Projection. Projection is a defense mechanism where individuals attribute their own unacceptable feelings or thoughts onto someone else. In this scenario, the student is projecting his feelings of failure onto the teacher and the course by blaming them for his poor performance. This allows the student to avoid taking responsibility for his own actions and emotions.

A: Undoing is a defense mechanism where a person tries to cancel out a previous unacceptable behavior or thought with a new one. This is not demonstrated in the scenario.

C: Regression is a defense mechanism where individuals revert to earlier, more childlike behaviors. There is no indication of the student displaying regressive behavior in the scenario.

D: Conversion is a defense mechanism where psychological stress is converted into physical symptoms. The scenario does not mention any physical symptoms being expressed by the student.

Therefore, the correct answer is B: Projection, as it best fits the behavior exhibited by the student in the scenario.