C. The pounding on the door stops, and Mr. White looks out on an empty street.
In supernatural short story "The Monkey's Paw," the author W. W. Jacobs creates tension when the Whites' dead son Herbert knocks the door after his mother makes a wish that he comes back. However, after an apprehensive scene, Mr. White goes out to find the street deserted.
Dr. Lanyon has learned damaging new information about Dr. Jekyll. I know this because after Utterson asks if Lanyon has seen Dr Jekyll, his face changes and he says he never wants to see him again.
