Question 5 of 10 What is the most effective type of research question? O A. A question that is challenging and does not have one correct answer O B. A question that is based on the personal or subjective opinion of the author C. A question that can be answered correctly using common sense o D. A question that can be answered completely through simple research​

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."

uncanny would be like unlucky or disaster. you can look for more in the dictionary or if you have text book then turn to a. 17 but it's different with textbooks.