On a Monday,Josh,the Owner of a Restaurant,tells Betty the Baker

On a Monday,Josh,the owner of a restaurant,tells Betty the baker that he might need a shipment of buns on Friday but he's not sure.He tells her that if she doesn't hear from him by noon on Thursday,she should deliver the buns on Friday.Receiving no word on Thursday,Betty delivers her buns on Friday.Which of the following is correct?

A) A bilateral contract was formed the moment they talked on Monday.
B) A contract was formed by Josh's silence.
C) A contract was never formed, because silence can never be an acceptance.
D) A unilateral contract was formed when Betty delivered the buns on Friday.
E) The contract was executed on Thursday when Betty did not hear from Josh.