The following words should be capitalized: B) A, D) Sound, and C) Thunder.
When it comes to the names of novels an such, all words (except for prepositions and linking verbs) should be capitalized. For example - The Lord of the Rings, A Sound of Thunder, etc.
It sets the mood for the scene or part of the story you are currently engaged in, it draws you into the book by having you feel how the author wants you to feel at that moment in the story.
Answer: He is not sane... He killed a man only because his eye bothered him. Then he hid him under the floorboards. The only way he could possibly be sane is because he confessed to the police when he could've gotten away. He did the right thing in the end but I would still consider him insane.
Explanation: