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.
She didn't stand up. She stayed seated
Dramatic irony is the answer to the question, it makes the most sense.
William joyfully ran to the giant department store.
To stay safe and if you mean like now stay away from people that might make you sick or unhealthy