Why is the answer E and not D?

@Zariyah-Hodge The correct answer is D: "It is less likely that one of the authors of Novel X or Novel Y is guilty of plagarism than that the similarity of themes and situations in the two novels is merely coincidental." Answer choice E is incorrect. Please let us know if you'd like further clarification.

Hey there.... Could you please explain why E is not correct? Thank you!

Hi, E is incorrect since we are not uncertain if the two authors are from similar backgrounds- we know for a fact that they are.