The author sets off the passage's final phrase with an em dash primarily to A.)It reviews the authors line of reasoning by listing the main points of the argument.
B.)it engages the audience his sympathies by suggesting parallels between Rowling and her fictional hero
C.) it contextualizes the argument by explaining the challenges that Rowling faced as a woman author.
D.) it enhances the authors credibility by relating a little known anecdote about Rowlings early interest in fantasy fiction.
E.) it captures the audiences attention by presenting an Imaginary scenario about how Rowling created Harry Potter.