Kathleen is writing an argumentative text about summer reading. Her daim 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. a price list of the books on Kathleen's school's reading list

B. a study revealing in the importance of summer reading

C. an interview with a local librarian about summer reading challenges

D. a study revealing that summer reading has no significant impact on student growth