Stacey dislikes physical education class because her classmates tease her about her lack of strength and coordination. One day Stacey unintentionally hits one of her classmates, and the teacher sends her to the principal's office for the remainder of the class time.
Stacey becomes increasingly aggressive in class and so spends more and more time in the principal's office. Use one or more concepts and/or principles from behaviorism to explain why Stacey has become more (rather than less) aggressive.