A charter school requires all of its teachers to grade each of their six classes on a curved scale. The top 15% of each class receives an A and the bottom 5% fails the class. This system is not fair. If a student is in an exceptionally gifted class, they could fail or receive a poor grade even if they did good work, while a student in an easier class could receive an A for poor work. Furthermore, grades are always arbitrary and teachers are likely to reward students they like better with higher marks.
Which of the following most accurately expresses the conclusion drawn in the argument?
