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I believe the answer would be the third, bc the plot seems to be abt a character forgetting someone’s death and that’s the only choice that correlates with what the author is trying imply?
The correct answer is A.
The author does not allude the visitor as being Herbert. He merely call it "the thing outside". Therefore, this is not a way the author creates suspense in the story.
The rest of the options: the description of the scraping, the echoes of the knocks, and the difficulty to find the object that was needed, are all elements that help build up suspense in this passage.