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.
Answer:
B.Indigenous people are uncivilized and immature.
Explanation:
Rudyard Kipling looks at the indigenous people as immature and uncivilized and it is the responsibility of the white man to train them, teach them, and educate them in order for them to live healthy and normal lives.
A.) I was thrilled to find my keys they had been lost since yesterday.
This is a "fused sentence" or also known as a run-on sentence.