Answer:A. fundamental attribution error.
Step-by-step explanation:
The fundamental attribution error is how we tend to focus on over emphasizing people's behavior as the result of their personality and tend to give less focus or under emphasize situational causes of those behavior.
This means when people behave a particular way our cognitive bias tend to deviate towards believing that it is because of their personality rather than considering the fact that they may also be influenced by social and environmental forces.
Dr Mitchell is introvert but being in a lecture room(social setting) changes him into being extrovert then the students assume that her personality based character.