Jane Austen uses Omniscient Narration to highlight her characters' traits in Pride and Prejudice. The book is generally narrated by the third person or as Elizabeth. But it allows the reader to study the characters by what they do, what others say about their endeavors and how they act in the presence of the other characters.
I would say that A is the answer. B is irrelevant, C makes the point debatable as it acknowledges that not everyone has access and I feel like A is more important than D to the sort of people who would set questions