The witches had claimed Macbeth would become king, Banquo wondered if it were true.
I believe the correct answer is C) predicate nominative, because that follows a linking verb (in this case, ISN'T), and is the first noun after that following verb, which is 'Stallion'.
I would say C
I personally would say C what is not 100% sure I'm sorry if its wrong.
The answers are: identify<span> the subjects of the passage and </span>
<span> Identify the purpose of the passage hopes this helps</span>