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Originally Posted by shakran
The real trouble with answer A is that it does not give the initial wisdom variables.
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But by the same token, it does not give the initial ring variables for the trees either.
After reading the question again, if sentence structure is not the reasoning behind the answer you could have another, slightly better reason for choosing A.
I believe the reasoning behind the answer is that all the variables in the example and in example A can be considered intrinsic properties of a certain object.
ie. In the example, altitude and thinness of air are intrinsic properties of a city
In choice A, age and wisdom are intrinsic properties of a person.
This does not hold true for choice B. I believe this is another reason why A could be the answer.
However even this is not bullet proof because it assumes that air IS an intrinsic property of a city and that a tree is not, reasonable assumptions to make...but you know what happens when you assume.