Mrs. Jones offers a reward for the return of her dog Fifi and puts posters advertising the reward all over her neighborhood. Mr. Brown finds and returns Fifi without seeing any of the posters. If Mr. Brown later sees one of the posters and asks Mrs. Jones for the reward money:

a. Mrs. Jone will have to pay Mr. Brown the reward money because she made a public offer.
b. Mrs. Jones will have to pay Mr. Brown the reward money because she left the posters up after Fifi had already been returned.
c. Mrs. Jones will not have to pay anyting to Mr. Brown because the offer was not communicated to him before he returned Fifi.
d. Mrs. Jomes will ot need to pay Mr. Brown the reward money because it is a unilateral contract.