you may be getting a bit of instruction in what passes for correct logic in a standardized test via the practice question. parallel sentence structure=,more important than actual logic.
the comparison itself is the same in a and b logically--neither seems to me more or less direct.
but (a) mimics the sentence form of the original.
it is hard to say if this would mean that the comparison was "more direct"--only that the terms involved are shorter word-wise so breaking the sentence in two (which b does to present the third step of the syllogism) makes sense for style reasons (not logically)
but if you think about it, b would appear more correct because it works in the same register as the example.
(a) refers to what we might politely call "conventional wisdom" which is of an entirely different order than (b), which refers to observable correlations within natural processes (change in altitude, thinness of air, age of a tree number of rings.)
but you are not really dealing with a logical question: you are dealing with a practice question for the LSATs, which are not logic tests--they aren't even very good tests--but to get where you want to go, you have to learn the peculiar rules of the test.
i would see if other practice questions also point you to style symmetry as determinate of correctness. if they do, then learn that little rule.
break a leg, btw.
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a gramophone its corrugated trumpet silver handle
spinning dog. such faithfulness it hear
it make you sick.
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