Which of the Following Scenarios Describes an Offer

Which of the following scenarios describes an offer?

A) Luther says to Consuela,"My son needs tutoring in Spanish.I'd like you to come to my home on Monday and Wednesday nights beginning next week for two-hour sessions,and I'll pay you $40 per hour.I'd like you to tutor him for the next three months."
B) Raoul asks Wendy if she would be willing to sell her first-edition copy of War and Peace.Wendy replies,"I couldn't possibly part with that book for less than a couple thousand dollars."
C) KD Lamp Company sends out a catalog to customers that lists prices for various types of light bulbs.
D) Nestor places an antique pocket knife,which he inherited from his father,up for auction.He tells the auctioneer that he hopes to get at least $250 for the knife.