The phrase <em>the antique fire truck </em>is used as a complete subject, because you are including all of these words to form a subject, so it cannot be a simple one (just one word). It isn't a compound subject either, because that would be two or more words connected with a conjunction <em>and, </em>or some other one.
If you asked your friend to hand you a book and he handed you a pencil instead, it is phonology as a language system that is most likely broken down. Phonology deals with systems of sounds which includes phonetics in a specific language.
The answer would be the first choice.
Tom placed the book on the shelf, it sat there for a week.
She is caring and warm,at first but then is cold and sly
