Final answer:
Edgar Allan Poe utilizes the repetition of the 'r' sound to emphasize the tapping at the door in the poem "The Raven", employing alliteration to enhance the narrative's suspenseful atmosphere.
Step-by-step explanation:
In the final two lines of the excerpt from Edgar Allan Poe's "The Raven", the aggressive repetition of the consonant sound 'r' is used to emphasize the knocking at the door. This sound is most notably repeated in the words 'rapping,' and 'chamber door.' The 'r' sound imitates the tapping and rapping sound, which creates an auditory sensation that mirrors the narrative action, thereby heightening the suspense and the narrator's sense of disturbance. This technique, known as alliteration, is often employed by Poe to lend a musical rhythm to his poetry while also emphasizing particular aspects of his dark and atmospheric narratives.