Nina owns a used car lot. Seth is a used car wholesaler who has a hugh lot of cars in the same city. She and Seth have phone discussions regarding her purchasing cars from him. Following the phone discussion, Nina signs and sends a fax to Seth which says, Confirming our agreement - I pick any 15 cars from your lot - 39% below blue book value. Seth receives and reads the fax, laughs, and throws it away. Two weeks later Nina arrives and demands to purchase 15 of Seths cars for 30% of their blue book value. Is he obliged to sell?