Susan Jones owned four speedboats named Leonardo, Donatello, Raphael, and Michelangelo. On April 2, Susan made written offers to sell the four boats in the order named for $4,200 each to Chris, Tucker, Sofia and Justin, respectively, allowing ten days for acceptance. In which, if any, of the following four situations described was a contract formed?

• Five days later, Chris received notice from Susan Jones that she had contracted to sell Leonardo to another buyer, Braden. The next day, April 8, Chris notified Susan Jones that he accepted Susan Jones's offer.
• On the third day, April 5, Tucker mailed a rejection to which reached Susan Jones on the morning of the fifth day. But at 10:00 A.M. on the fourth day, Tucker sent an acceptance by telegram to Susan Jones, that she received at 12:00pm on the same day, that he had accepted her offer.
• Sofia, on April 3, replied that she was interested in buying Raphael but declared the price asked appeared slightly excessive and wondered if, perhaps, Susan Jones would be willing to sell the boat for $3,900. Five days later, having received no reply from Susan, Sofia, by letter, accepted Susan's offer and enclosed a certified check for $4,200.
• Justin was accidentally killed in an automobile accident on April 9, the following day, the executor of Justin's estate mailed Susan an acceptance of her offer.