It has something to do with the book I would guess just read it
Answer:
its D
Explanation:
i have done it on a test before
A predicate nominative is a word or word group that is in the predicate and that identifies the subject or refers to it. A predicate nominative appears only in a sentence that has a linking verb. Common linking verbs include is, was, will be, has been, and could have been.
It is C.
Volunteer is a predicate nominative.
<em>Hope this helps!</em>