Terry's dog, Kelly was lost. Terry was very concerned and put up posters with a picture of Kelly, and offered $400 reward for the safe return of the dog. Based upon the assigned readings from your Business Law textbook, which of the following is CORRECT

A. The offer to pay $400 is a unilateral contract

B. A dog cannot be the subject matter of a contract

C. The $400 reward is a invitation to treat

D. The offer to pay $400 is a gratuitous promise