The owner of a lost dog posts notices that she will pay 200 for its return. Someone who does not ...

The owner of a lost dog posts notices that she will pay 200 for its return. Someone who does not know about the reward finds the dog and returns it. The owner.
 a. must pay the reward due to public policy considerations that encourage the completion of such contracts b. must pay the reward because the unilateral contract was completed
  c. must pay the reward because there was an intent to make a valid offer and to be bound by that offer
  d. does not have to pay the reward because the offer was not communicated to the person who found the dog e. does not have to pay the reward because there was no meeting of the minds