Efforts to get the public to exercise regularly, which have emphasized the positive health effects of exercise rather than the dangers of a sedentary lifestyle, have met with little success. In contrast, efforts to curb cigarette smoking, which have emphasized the dangers of smoking rather than the positive health effects of quitting, have been highly successful. Thus, efforts to get the public to exercise regularly would be more successful if they emphasized the dangers of a sedentary lifestyle rather than the positive health effects of exercise. Which one of the following is an assumption on which the argument relies? ['The health risks associated with a sedentary lifestyle are as great as those associated with smoking.', 'Efforts to curb cigarette smoking would not be more successful if they emphasized the positive health effects of quitting rather than the dangers of smoking.', 'The majority of people who successfully quit smoking cite health concerns as the primary motivation for their success.', 'Although most smokers are aware of the dangers of smoking, few are aware of the positive health effects of quitting.']