John, a car salesman, is trying to persuade a customer to trade in his gas-guzzling, 8-cylinder car for a new 6-cylinder model. So he says to his customer, "Think of all the extra money you'll have if you buy this fuelefficient model!" According to Kahneman and Tversky, John's sales pitch would be much improved if he had said: a.) "Not only is this model fuel efficient-it has a great safety record, too!" b.) "Look at this article by Consumer Reports. No other model in its class gets this kind of mileage on the freeway!" c.) "Think of all the money you're losing on that gas-guzzler-dollar bills are flying right out of the exhaust pipe every time you drive!" d.) "Buying this fuel-efficient model is a good way to show your concern for the environment