Kathleen is writing an argumentative text about summer reading. Her claim is that summer reading does not prevent the "summer slide"--what educators call the loss of academic knowledge over summer vacation. Which example below best supports her claim? A. an interview with a local librarian about summer reading challenges B. a study revealing in the importance of summer reading C. a price list of the books on Kathleen's school's reading list D. a study revealing that summer reading has no significant impact on student growth