In Gandania, where the government has a monopoly on tobacco sales, the incidence of smoking-related health problems has risen steadily for the last twenty years. The health secretary recently proposed a series of laws aimed at curtailing tobacco use in Gandania. Profits from tobacco sales, however, account for ten percent of Gandania' s annual revenues. Ttherefore, Gandania cannot afford to institute the proposed laws. Which of the following, if true, most seriously weakens the argument? ['Implementing the proposed laws is not likely to cause a significant increase in the amount of tobacco Gandania exports.', 'No government official in Gandania has ever previously proposed laws aimed at curtailing tobacco use.', 'All health care in Gandania is government-funded.', 'The percentage of revenue Gandania receives from tobacco sales has remained steady in recent years.']