1. On January 1, Celeste, a construction worker, sent a signed letter to John, a policeman, offering to sell to John a used watch for $300.In the letter, which accurately described the watch and indicated the price, Celeste wrote: "I promise to keep this firm offer open to you for 5 months from today, (signed) Celeste."John received the letter on January 4.On April 15, Celeste decided that she no longer wanted to sell the watch.On that same day, Celeste sent a letter to John telling him that the January 1 offer was no longer open to him.John received the letter on April 17.On May 25, John sent a letter to Celeste saying, "I accept your offer of January 1."Celeste received the letter on June 5.Celeste refused to deliver the watch to John.John sued Celeste for breach of contract.