In a group discussion about James Fennimore Cooper, which sentence is most clearly using evidence from outside resources?

AAccording to Mark Twain's essay, "Fennimore Cooper's Literary Offenses," Cooper was completely overhyped.
BOne of James Fennimore Cooper's most enduring and emotional stories is The Last of the Mohicans.
CStories like The Deerslayer show that James Fennimore Cooper was a product of the Romantic era, nothing more.
DJames Fennimore Cooper's Leatherstocking Tales is both surprisingly enlightened and prejudiced.