The answer to which of the following questions would be most helpful in evaluating the argument? A. Do physicians who have been diagnosed with sleep disorders also show signs of other ills not related to sleep deprivation? B. Is the ability to recognize the symptoms of sleep deprivation in others significantly impaired by habitual sleep deprivation? C. Do factors other than habitual sleep deprivation ever lead to errors in the workplace on the part of physicians? D. Of people who have recently been treated by physicians, what percentage believe that many physicians have occasionally suffered from sleep deprivation? E. Is the incidence of sleep deprivation higher among physicians than it is among other health care workers?