Final answer:
Greg is providing an example of the fundamental attribution error by concluding that Claire is yelling at him because she is a mean person, without taking into account the possibility of situational factors.
Step-by-step explanation:
Greg is providing an example of the fundamental attribution error. The fundamental attribution error is the tendency to attribute someone's behavior to internal factors (such as disposition or personality) rather than considering situational factors that may have contributed to their behavior.
In this case, Greg is assuming that Claire's yelling is because she is a mean person, without considering the possibility that she might be venting after having a rough day (a situational factor). This demonstrates the fundamental attribution error, as he is attributing her behavior solely to her disposition.