The correct response is:
by contrasting the reactions of Elizabeth and Mr. Collins
This choice reflects how the third-person omniscient narration allows readers to see the differing perspectives and values of both characters regarding marriage. Mr. Collins views marriage as a social obligation and a means to secure his future and that of his benefactor, while Elizabeth prioritizes personal happiness and compatibility over societal expectations. This contrast highlights Austen's critique of the traditional views on marriage during her time.