To accurately determine the best quotation from "A Simple Act" that supports the answer to Part A, we would need to know what Part A specifically asks about. However, based on the options provided, if Part A revolves around themes of trust, meaningful relationships, or the impact of one individual on another's life, then the most fitting choice would likely be:
C. "The writer Ernest Hemingway said, 'The best way to find out if you can trust somebody is to trust them.' Over the years, Laura discovered the truth of that statement."
This quotation directly addresses the concept of trust, which might be central to the context of Part A. If the focus were on the impact of mentoring or education, then option A could also be appropriate. Please provide more context for a more tailored response.