The Meaning of "Why Can't Roger Learn?" Is That

The meaning of "Why Can't Roger Learn?" is that

A) clarity of assignment combined with fear of punishment is a good leadership approach.
B) slow learners exist everywhere.
C) if a student doesn't learn, it is the parents' fault.
D) a leader/teacher's ability to teach is an important determinant of the learner's performance.
E) a good teacher does not make a good leader.