Answer: D) Excited and relieved.
Explanation: The tone of a text or sentence is the author's or speaker's attitude towards the audience, the subject or even the characters of the text. There are many different kinds of tones, like: positive, negative, objective, sad, angry, etc. In the given passage from "Frankenstein" by Mary Shelley we can see that the overall tone is excited and relieved, we can clearly see this in the phrase " but when I became assured that my enemy had indeed fled, I clapped my hands for joy, and ran down to Clerval."
The answer would be "A'", to connect and engage with the audience.
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.