Why is the Prefect's visit a coincidence? A. The narrator had been thinking about an odd case, and the Prefect has lived amid a world of oddities for some years. B. The narrator was just thinking about the M. Rogêt case in which he and Dupin worked with the Prefect some years before. C. The narrator and Dupin are sitting in the dark, as they had been when they last saw the Prefect some years before.