The answer to this question is "none of the above." The narrator in Poe's "The Black Cat" does not kill the cat, but at the end, does attempt to kill the cat but is stopped by his wife. The answer is similar to A. in which the narrator "slowly builds up to the moment", but he does not kill the cat. When he tries to kill it, his wife stops him, and he kills his wife instead. The slow build-up shows the narrator starting out as a logical man and slowly losing his mind, which makes the reader question if what the narrator is experiencing is real.