The author suggests which one of the following about the dramatic works that most influenced Webster's tragedies? A. They were not concerned with dramatizing the conflict between good and evil that was presented in morality plays. B. They were not as sophisticated as the Italian sources from which other Elizabethan tragedies were derived. C. They have never been adequately understood by critics. D. They have only recently been used to illuminate the conventions of Elizabethan drama. E. They have been considered by many critics to be the reason for Webster's apparent artistic incompetence.