Marlena offered to sell her car to John for $80000. John said that he would need some time (3 days) to think about it and would get back to her. After two days Marlena called John and said that since she hadnt heard from him, she sold the car to someone else. John immediately said the Marlena cannot do this and informed that he is ready to buy the car at the offered price. Advise John as to whether he is entitled to the car or was Marlena under no legal compulsion to wait for 3 days to hear from John?