Final answer:
Elizabeth Bennet refuses Mr. Collins' proposal due to lack of love, prioritizing her happiness, intellectual compatibility, and self-respect.
Step-by-step explanation:
The reasons Elizabeth Bennet gives Mr. Collins for her refusal in Jane Austen's Pride and Prejudice are not directly stated in the provided excerpts.
However, from the known narrative of the novel, Elizabeth refuses Mr. Collins' proposal primarily because she does not love him and values her own happiness and intellectual compatibility over convenience and financial security.
Her refusal stems from a strong sense of self-respect and an understanding of the importance of mutual respect and affection in marriage, values that were revolutionary at her time.