When best friends Debra and Karen arrive at history class, Debra realizes that she forgot to study for the day's quiz. "Don't worry," Karen tells her, "sit next to me, and I'll write the answers on my leg so you can see them." Debra copies most of Karen's answers, changing them just enough that the teacher won't suspect that she's cheating. Both girls get an A-on the quiz. This strategy becomes a habit for the girls. Debra continues to get good grades by cheating rather than studying, and her continuing words of gratitude give Karen a sense of pride. Which  alternatives best explains what's happening here?