2010gmat wrote:On some hot days the smog in Hillview reaches
unsafe levels, and on some hot days the wind blows
into Hillview from the east. Therefore, on some days
when the wind blows into Hillview from the east, the
smog in Hillview reaches unsafe levels.
The reasoning in the argument is flawed in that the
argument
(A) mistakes a condition that sometimes
accompanies unsafe levels of smog for a
condition that necessarily accompanies
unsafe levels of smog
(B) fails to recognize that one set might have some
members in common with each of two others
even though those two other sets have no
members in common with each other
(C) uses the key term "unsafe" in one sense in a
premise and in another sense in the
conclusion
(D) contains a premise that is implausible unless
the conclusion is presumed to be true
(E) infers a particular causal relation from a
correlation that could be explained in a
variety of other ways