Read this passage from "The Black Cat": This hideous murder accomplished, I set myself forthwith, and with entire deliberation, to the task of concealing the body. I knew that I could not remove it from the house, either by day or by night, without the risk of being observed by the neighbors. Many projects entered my mind .

What does the businesslike tone of this passage help the reader infer about the narrator?

A. That the events are a figment of his imagination
B. That he is calm and handles pressure well
C. That he believes he is doing the right thing
D. That he has no morals and might possibly be insane