Doug Posted Notices All Over the Neighborhood Offering a Reward

Doug posted notices all over the neighborhood offering a reward of $100 to anyone who found his lost border collie,Lyla.Dr.Davidson who lived down the street was walking his dog in the river valley when he saw Lyla,who plays with his dog frequently.He returned Lyla back to Doug.Doug thanked him and Dr.Davidson returned home.He explained what he had done and then his children asked him if he had received the $100 reward being offered by Doug.When he stated he had not,Dr.Davidson's children insisted that he return to Doug's home and ask for the reward.When Dr.Davidson asked Doug for the reward,Doug told him that it was too late and he did not have to pay it.Which of the following is true?

A) Doug must pay the reward because Dr.Davidson accepted his offer by performing the act of finding Lyla,so there is a contract consisting of offer and acceptance.
B) Doug does not have to pay the reward because the offer was a unilateral offer open to the public at large and Dr.Davidson was unaware of the offer when he returned Lyla to Doug.
C) Doug must pay the reward because Dr.Davidson accepted his offer when he learned of it from his children.
D) Doug must pay the reward because there was a bilateral contract of offer and acceptance and,therefore,a contract was formed.
E) Doug does not have to pay the reward because Doug and Dr.Davidson are friends (even their dogs are friends) and friends cannot enter into unilateral contracts,only bilateral contracts.