My little brother loves climbing up trees
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.
A predicate is describing what the subject is, or does.
Answer:
D, because paintbrush and easel are both supplies and it would make sense for the last column to also be a painting supply.
