Sam places an advertisement in the newspaper for his Dodge Viper which states, "I hate to sell it, but high insurance costs force me to sell my 1999 Dodge Viper. The first $45,000 cash takes it." Betty goes to look at the car and says to Sam, "1'11 give you $42,000 for it." Sam then says, "That's not the deal." Betty says nothing and leaves. A couple of weeks later Betty notices that the ad is still in the paper, so she takes $45,000 cash over to Sam's house. He hasn't sold the car, but says to Betty, "You rejected my offer of $45,000, so I don't have to sell it to you for that. You can have it for $47,000." Is Sam obligated to sell the car to Betty for $45,000? Give all possible arguments for each party