69) Sam receives an offer that states: "I will sell you my car for $8,500, you have 10 days to accept." On Day 4, Sam tells the seller that he will give him $8,000, but the seller rejects this. Which of the following is true? A) If Sam tells the seller within 6 days that he'll pay the $8,500, a contract is formed. B) Sam's only alternative is to pay the asking price for the car. C) If the seller changes his mind within 6 days, he can make Sam buy the car for $8,000. D) There is no open offer. E) If the seller does not want to sell his car to Sam for $8,500, he must revoke his offer