Last year, 1,200 Smithtown residents who work in hospitals and doctors' offices contracted the flu, and 1,100 Smithtown residents who are not employed in medical facilities contracted the flu. On the basis of these numbers, it is safe to conclude that the likelihood of contracting the flu was not much different for those who were employed in medical facilities than it was for those who were not.

Which of the following would reveal most clearly the irrationality of the conclusion above?

A Counting cases of the flu among home health care workers as well as cases among workers at medical facilities
B Expressing the difference between the numbers of flu cases among medical facility workers and others as a percentage of the total number of flu cases
C Counting flu cases contracted by medical facility workers while at work separately from those contracted by medical facility workers while not at work
D Comparing flu cases per hundred members of each group, rather than comparing total numbers of flu cases in each group
E Comparing flu cases contracted in medical facilities by people who do not work in those facilities to flu cases contracted in medical facilities by people who do work in them