Exuse me, but I don't understand what you are saying. Are you referring to another question you posted? I really want to help you but I don't understand your question.
The answer is A because it has a comma and they are excited about their trip
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.
I don't know gosh I'm just doing this for my homework