Mary Places an Notice in a Local Variety Store

Mary places an notice in a local variety store. The notice is as follows: "I shall pay $1,000 for the return of my dog, Mundo." Jim sees the notice. Jim finds the dog and returns it to her. Which of the following is true?

A) The notice is an invitation to treat and could not give rise to a contract.
B) Mary makes a counteroffer.
C) Mary is obliged to pay Jim because by finding the dog, he accepted the contract and no notification was needed.
D) Mary can refuse to pay Jim because Jim did not communicate his acceptance of the offer to Mary, and an acceptance must be communicated to the offeree.
E) When Jim finds the dog, he makes the offer and it is up to Mary to determine whether she wishes to accept the offer. Mary is thus entitled to reject the offer.