What does Rainsford’s repetition of the word “nerve” in paragraph 170, paragraph 180, and paragraph 198 reveal about his character?

Question

1. Rainsford’s repetition characterizes him as forgetful, which is why he must repeat the word to remember his mission.
2. Rainsford’s repetition shows that with his great skill and perseverance he was able to survive.
3. Rainsford’s repetition was probably taught to him in a private school growing up and is a symbol of his class status.
4. Rainsford’s repetition of “nerve” refers to the nervous system and neurons in the brain, and emphasizes human reason as the most important key to success.