Which of the following most logically completes the argument?
Ten years ago, the country of Benovia adopted new workplace safety regulations requiring protective equipment, improved training procedures, and upgraded machinery safeguards for all new manufacturing facilities. In the last few years, the annual number of factory workers hospitalized overnight or longer for injuries sustained on the job has been significantly lower than it was before the regulations went into effect. This evidence does not show that the regulations have made manufacturing work safer, however, since __________.
A. over the last ten years, production quotas have increased at many of Benovia’s largest manufacturing plants
B. of the patients treated at hospitals in Benovia, the percentage being treated for workplace injuries has not decreased in the last few years
C. five years ago, hospitals in Benovia adopted stricter criteria for determining when a patient needs to stay overnight
D. most manufacturing facilities currently operating in Benovia were built or upgraded within the past ten years
E. the proportion of factory workers who regularly bypass safety procedures has changed very little since the new regulations were adopted