Although some nutritional facts about soft drinks are listed on their labels, exact caffeine content is not. Listing exact caffeine content would make it easier to limit, but not eliminate, one' s caffeine intake. If it became easier for people to limit, but not eliminate, their caffeine intake, many people would do so, which would improve their health. If all the statements above are true, which one of the following must be true? ['The health of at least some people would worsen if everyone knew exactly how much caffeine was in their soft drinks.', 'The health of at least some people would improve if exact caffeine content were listed on soft-drink labels.', 'Many people will find it difficult to eliminate their caffeine intake if they have to guess exactly how much caffeine is in their soft drinks.', 'Many people will be unable to limit their caffeine intake if exact caffeine content is not listed on soft-drink labels.']