What literary device is , “and his heart was often in his mouth,...”

there is no reason to represent a false dillemma.

i'm a frog i'm a frog i read about frogs i breath thee frogs the frogs are great but not me

alone =having no one else present.

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."