Step I biostatistics question

[dontwantaids]

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hey guys, confused about the following question. I get why 'd' is the answer, but what's wrong with 'b'. study 'b' doesn't seem to prove causality because the confidence interval includes the number '1'. thanks.

 

[Fewa Fibroblast]

I think, since the relative risk does not fall within the CI, we can't comment anything on the study ....so 'd' becomes more accurate statement than 'b'. Hope you got it..