A researcher is looking at 200 children, of which 100 went to day care and 100 did not. Of those children who went to day care, 90 caught a cold. Of those that did not go to day care, 75 caught a cold. What is the relative risk of developing a cold for those in day care compared to those not in day care?

A. (90/100) / (75/100)

B. (90/100) - (75/100)

C. 90 / 165

D. 25/35

E. (90*25) / (10*75)

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