The correct option is D Demanding mentor.
The correct answer for this would be option D. Edward was a demanding mentor when it came to the narrator. He was harsh with the latter, and demanded his best performance, not settling for anything lesser. There was no rivalry between them, neither a hint of alliance. He certain wasn't sympathetic towards the latter. Edward's judgement for his work did not dampen his call for perfection. Thus, options A,B and C are incorrect.