33 LR Two Question 5
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I don't really see the false choice here (but there may be one that I'm not seeing).
(B) would mkae more sense in a passage that said only that dental x-rays were OK on balance (or something like that).
Here, we're specifically told that x-rays don't cause harm, so we don't need to assume that they do not have an effect on other risks in order to make our argument; we just need to know that there's nothing about flying that's different from x-rays.
It might help to review the underlying idea in the Analogy error (or check out the PDF version).
Here, the argument has assumed that the analogy between X-rays and flights holds—that they are equal in every respect.
(D) functions in the expected way by pointing out that this assumption neglects to consider that maybe flights are different from X-rays in some important respect (namely, that you don't go to the dentist's office once or twice every day your whole life).