What Is a Realistic Concern with Regard to Requiring All

What is a realistic concern with regard to requiring all high school seniors to pass a graduation test in order to earn a diploma?

A) It is likely that virtually all students would be qualified to pass such an exam.
B) The financial costs associated with failing students would create a huge incentive for states to develop exams with very low requirements for passing.
C) The economic, social, and political costs of holding back such large numbers of students because they could not pass the "exit exams" would be worth the risk of graduating students who did not deserve a diploma.
D) All of these statements are false.