Inez, Wishing to Sell a Used Business Law Book, Calls

Inez, wishing to sell a used business law book, calls Janice and tells her that if she does not hear from her within twenty-four hours, she will assume that Janice wishes to purchase the book for $50. After the expiration of twenty-four hours, which of the following is correct regarding the status of the proposed book sale?

A) There is no contract because silence, as a general rule, cannot be used to form a contract.
B) There is no contract because the offer was not made in person.
C) There is no contract because the offer was not made in writing.
D) Janice can avoid there being a contract only if she can prove by preponderance of the evidence that she did not hear about the offer before the stated expiration time.
E) Janice can avoid this being a contract only if she can prove beyond a reasonable doubt that she did not hear about the offer before the stated expiration time.