Answer choice is showing another phenomenon that occurred at the same time as the reduction in the number of beds. This phenomenon could cause the increase in mortality all by itself, even without a decrease in number of beds. Any time we have a situation like that, it raises the possibility that the originally-attributed cause (bed reduction) may not be the cause after all. Certainly, it's still possible that either or BOTH of these factors are to blame. But introducing this second possible cause
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