Which choice best describes the underlined words in this sentence?

There goes that antique fire truck from the car show.

none of the above

complete subject

simple subject

compound subject

Compound subject, because it is the antique fire truck, with the addition of, it's from the car show.

The phrase the antique fire truck 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 and, or some other one.