Step 1: Understanding the judgment error.
When judging others’ behaviour, people often overemphasize personal traits and underemphasize situational influences.
Step 2: Explaining the fundamental attribution error.
The fundamental attribution error refers to the tendency to attribute others’ actions to internal dispositions rather than external circumstances.
Step 3: Eliminating other options.
The frustration-aggression hypothesis explains aggression, reinforcement laws explain learning, and the overjustification effect concerns motivation, not social judgment.
Step 4: Conclusion.
Hence, people neglect situational factors because they commit the fundamental attribution error.
Final Answer: (A)