Read the scenario below and answer the question that follows. After a long day of being nice to impolite customers at the restaurant where she works, Marisa comes home and unwinds by playing several hours of a violent video game. When she is finished playing, she feels a little better about all of the times she had to endure the rudeness of her customers and couldn't say what she was thinking. A psychologist would say that she enjoys the game because it acts as a __________.