The best response to the question about why the author might have decided to include the quote by Nellie Bly is: to show that Bly was an earnest reporter and was committed to reporting the truth.
This choice highlights Bly's determination to uncover the realities of life in the asylum and emphasizes her dedication to impactful journalism. Including this quote underscores her motivation and the seriousness of her task, which aligns with her goal of providing a truthful account of the treatment of patients.