page 109 of the book Autism And Schools, by Breanaa Hills and Chris Johnson, edited by Jerome Sands and published in 2015 by Harper NOTE: If the program will not allow you to use italics or underlining, you may ignore this formatting.

answer: "the beating heart symbolizes the narrator's conscience, or his sense of guilt and wrongdoing" so its b

explanation:

"to look at him, or hear him describe it, he had no guilt. however, poe decided to symbolize this man's subconscious guilt through the heartbeat."

the answer to "what does the narrator realize by the end of the story" is b.