Industry experts expect improvements in job safety training to lead to safer work environments. A recent survey indicated, however, that for manufacturers who improved job safety training during the 1980s, the number of on-the-job accidents tended to increase in the months immediately following the changes in the training programs. Which one of the following, if true, most helps to resolve the apparent discrepancy in the passage above? ['A similar survey found that the number of on-the-job accidents remained constant after job safety training in the transportation sector was improved.', 'It is likely that the increase in the number of on-the-job accidents experienced by many companies was not merely a random fluctuation.', 'Significant safety measures, such as protective equipment and government safety inspections, were in place well before the improvements in job safety training.', 'Manufacturers tend to improve their job safety training only when they are increasing the size of their workforce.']