It'd be useful if we knew what the hell you were talking about, my man.
Answer:
Montresor's revenge scheme is unsuccessful because it does not ultimately fulfill either of his two rules of revenge: “I must not only punish, but punish with impunity” and “the avenger [must] make himself felt as such to him who has done the wrong”
Explanation:
I am not sure. But, i believe it is D
I believe its D since "them" is receiving the action of "taught"