The best response to how the setting of the library influences Carol's belief that all things make sense is:
The setting provides Carol with a quiet place to reflect on her beliefs.
In the library, surrounded by books and the peaceful environment, Carol has the opportunity to think deeply about her experiences and the changes in the book’s story. This reflection leads her to contemplate the mysteries of life and the nature of her beliefs, demonstrating how the library serves as a catalyst for her thoughts.