It has been a long time since I have read this book but I would say the moral of the Mirror of Erised is to not dwell on the past. To not focus on what you do not have and instead to focus on what you do have and make the most of it. Harry was so intrigued by seeing his family in the mirror that he no longer accepted that he was an orphan and Dum bledore had to put an end to it. Instead of dwelling on desires, make the most of what you already have.
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The answer is option A: It makes the reader question why this unusual man has arrived.
In the excerpt from the story "The Monkey's Paw," the author creates suspense by describing Morris' appearance in detail. In this way, readers develop a feeling of uncertainty, mystery and expectation in their minds, wondering who the person is and how he will act.