A woman just found out that she had passed the Bar Examination. She was so overjoyed that she called her former Bar Examination tutor and promise to give the tutor a new Ferrari automobile as a token of her appreciation for the tutoring that helped her pass the Bar Examination. The tutor immediately gave away her car and then went to a Ferrari dealership and picked out a red Ferrari that she loved. The tutor then called the woman to make arrangements for the woman to come to the dealership and pay for the car. The woman laughed and said, "Surely you didn't believe me, did you?" The tutor said, "Yes, I did, and I'll see you in court. I'm going to sue you."

In evaluating the woman's statement about paying for the Ferrari,  find the correct and applicable law to the case.