GRE Big Book Test 2 Section 1 TC

Here, could anyone please explain why B is wrong? How do we know that scientists are studying biological reaction/ human body (since OA is A), but not emotional reaction (in B)?

How does being “concerned” about cancer causing agents actually after how much cancer you develop?

It seemed absurd to me too initially, but then I thought maybe the experiment might be based on “beliefs” and could be possible. But I guess that that’s some storytelling on my part.
Thanks

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