Many universities offer two types of learning: frontal, in-class lectures and virtual classes that are a review of the in-class lectures. Research into the concentration ability of students in today's tech savvy world has found that students are less likely to text messages on their phones during the virtual classes than they are during the real classes. However, it has also been determined that students' attention spans are higher in real classes than they are in the virtual classes.
If the statements above are true, which of the following must be true?
A. Texting on one's phone during in-class lectures is an activity that students are fully concentrated on.
B. The amount of attention span is directly proportional to how interesting a lecture or virtual lesson may be.
C. The level of success a class has in terms of catching student attention is not necessarily lower when students text messages.
D. Between the two types of classes, students will get enough information to help them pass a class.
E. It is unnecessary to be fully concentrated in both types of classes.