To encourage students who are concerned about their GPAs to take harder classes, professors of these classes should: Question 7 options: not grade on a curve, because grading on a curve will only reduce students' incentive to study, particularly if the material is hard. grade on a curve because it increases students' incentive to study, even when the material may be hard. grade on a curve because it increases students' incentive to study, even when some students in the class may be smarter than others. not grade on a curve, because grading on a curve will only attract lower-level students who are less likely to study