D) the fact that students only read Shakespeare’s greatest works in school and thus never see his weaknesses
In the passage, the author states that "We shouldn't shy away from discussing our literary heroes' flaws...the knowledge of their failures helps us appreciate what success and greatness these authors did achieve." So often in school only the greatest of Shakespeare's works are studied or even brought to the attention of students. It is very rare that one of Shakespeare's lesser known or almost forgotten works is studied. For this reason, students never see his weaknesses as a dramatist and poet. This is the reason he is not seen as a real, flawed human being.