A drought hits corn-growing regions, reducing the supply of corn. (Click to select) b. The government announces a new subsidy to encourage consumers to purchase biofuels made from corn. (Click to select) c. A global recession reduces the incomes of consumers in poor countries who rely on corn as a staple food (assuming corn is a normal good). (Click to select) d. A new hybrid variety of corn seed causes a 15 percent increase in the yield of corn per acre. (Click to select) e. An advertising campaign by the beef producer's association highlights the health benefits of corn-fed beef.