Together we promise to share our lives, fortune, and sacred honor!
I think it’s A and C i am not 100% sure
Answer:
Either, but if you need to pick one it would be noun.
Explanation:
The predicate nominative (or predicate noun) is the noun or pronoun that comes after a linking verb. It renames the subject of the sentence. The sentence should still make sense if you switch the predicate nominative and the subject.
A sentence needs an capital letter, correct grammar and punctuation marks.