Answer:
E. A self fulfilling prophecy
Step-by-step explanation:
Self fulfilling prophecy is a situation or psychological term whereby an individual predicts or expects something, in which the prediction or expectation comes to pass because the individual believes it will, thus the behaviour that follows is in line with that beliefs. It is a prediction that is made to be true because of the behaviour of the believer. In this scenario, the waitress assumes and believes the group of people to be poor, this behaving in a way that neglected them which gender up with here recieving a bad tip. That is, her behaviour making her predictions about them to be true.