The answer is C. because A and D are in the exposition of the poem. and B is the last sentence, serving as a most unsettling resolution.
C. "<span>I took from my waistcoat-pocket a pen-knife, opened it, grasped the poor beast by the throat, and deliberately cut one of its eyes from the socket!" is the best example of rising action in "The Black Cat" of the choices given.</span>
Ok, so I'm going to try my best to answer this.
My best guess would be how he said that he was able to see his answer through whoever he is talking to, then lose it again. He understood and got something, then lost it's understanding. I sincerely hope this helps.. I'm sorry I'm not very good at explaining. ^^;
I am sure that the right answer is B) compare- contrast
good luck ;)