Cheever College offers several online courses via remote computer connection, in addition to traditional classroom-based courses. A study of student performance at Cheever found that, overall, the average student grade for online courses matched that for classroom-based courses. In this calculation of the average grade, course withdrawals were weighted as equivalent to a course failure, and the rate of withdrawal was much lower for students enrolled in classroom-based courses than for students enrolled in online courses.

If the statements above are true, which of the following must also be true of Cheever College?

• AAmong students who did not withdraw, students enrolled in online courses got higher grades, on average, than students enrolled in classroom-based courses.  
• BThe number of students enrolled per course at the start of the school term is much higher, on average, for the online courses than for the classroom-based courses.  
• CThere are no students who take both an online and a classroom-based course in the same school term.  
• DAmong Cheever College students with the best grades, a significant majority take online, rather than classroom-based, courses.  
• ECourses offered online tend to deal with subject matter that is less challenging than that of classroom-based courses.