74 LR One Question 18
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(B) is incorrect because in order to conclude that sleep deprivation is good for you (or that sleep is bad for you), we do not have to assume that sleep deprivation is the only thing that's good for you (or that sleep is the only thing that's bad).
(E) would probably be an effective assessment if the evidence in the argument were about a specific illness and the conclusion were about illnesses in general.
However, that's not the case here: there is no specific phenomenon from which the argument attempts to derive a general claim.
Or, say it another way, the conclusion of this argument wouldn't be harmed at all if we learned that there are other negative consequences to sleep deprivation.
Ah, yeah. Sure, I could totally see that "not getting ill" is a negative consequence and that there's some other consequence besides illness that might make people unhealthy. That checks out.
But then we've got the content error in (E): this argument has not claimed that illness is "not associated" with sleep deprivation. On the contrary, we know that it is associated, just at a lower rate than among those who sleep 8 hours per night.