Most industrialized nations face the prospect of losing most of their manufacturing jobs to less-developed nations within the next few decades. Many of these nations will have a number of idle manufacturing facilities that will be unusable for other purposes. To combat this future job loss and waste of resources, industrialized nations have to train their workers to be more productive. Which one of the following would most strengthen the above argument? ['If workers were more productive in industrialized nations, manufacturers would not move their jobs to less-developed nations.', 'If workers were trained in other fields, there would be no need to try to maintain manufacturing jobs in industrialized nations.', 'Manufacturing jobs are important for industrialized nations.', 'Many manufacturing workers will be unable to make as much money in other fields.']