Alex tries to distract her teacher during the class by throwing erasers on the board. Alex's teacher talks to her about her misbehavior, but Alex continues to show this behavior on multiple occasions. The teacher realizes that Alex indulges in this behavior to get her attention. The teacher ignores Alex's misconduct, and soon Alex stops throwing erasers during the class. According to operant conditioning, this scenario exemplifies _____.

systematic desensitization
generalization
extinction