Maxine, a physics lecturer, assigns her students a five-page-long assignment on the theory of relativity that needs to be submitted in two days. Only 40% of the class completes the assignment within the specified time. Noticing the delay in submission, Maxine tries to convince her students in a different way. She tells them that though the assignment involves extensive research and is difficult to complete within a short time, it is important as the scores obtained will be added to their physics theory scores. The next day, almost 70% of the class turns up with their assignments. In the context of persuasion, this scenario illustrates: