I was to choose between A & E.....My choice was finally A!
But now that I look at it, E is perfect. I did not consider that a subset of total population, those who have spent time with pet and wild animals is closer than general public.
Here is the argument in favour of E:
Premise: Some 30% of all people who work at zoo seemed to contract allaergies.
Premise II: Of all those who do contract diseases, most peope chuck their jobs.
Conclusion: More than 30% of the employees contract such allergies.
Conclusion II: Overtime of all the people who have had given amount of exposure with animals more than 30% of people wil likely have alergies.