Which of the Following Would Be the Correct Analysis of the Effect

Which of the following would be the correct analysis of the effect of the discovery that Rick has a book that is not appropriate for the class?

A) Rick is stuck with the book because he objectively agreed to purchase it.
B) Rick is stuck with the book because Beverly did not commit fraud.
C) Rick is stuck with the book because Beverly subjectively thought it was the correct book, and Rick did not openly disagree before the contract was executed.
D) Because the parties had a mutual misunderstanding, the parties did not come to a meeting of the minds, and there is no contract.
E) Because both parties were mistaken, at Rick's option he may return the book; but only half of the purchase price would be required as a refund from Beverly because she is not guilty of fraud.