The correct response is:
It challenges the reader’s idea about what it means to think you know something.
Why: The detective's assertion that "if there’s one thing I know, it’s that I know nothing" serves as a paradoxical statement that prompts readers to reflect on the nature of knowledge and certainty. While the townspeople are quick to offer their theories and express their confidence in their beliefs, the detective embodies a humble understanding of her limitations. This contrast highlights the idea that confidence in one's knowledge does not always equate to having the truth. Ultimately, it encourages readers to consider the complexity of knowledge and the ease with which assumptions can lead to misunderstandings.