Explanation
Let's form our own theory about this question before we
have to run the gauntlet of temptation that is a set of answer choices. The
whole point of calling someone a "presumed expert" is that there are situations
in which expert intuition is only allegedly in use. That's the point of the
passage--we need to know when it's applicable. Specifically in line 49, the
author is describing a regular environment, and saying the presumed expert must
have a sufficient level of practice. So the presumed expert, in this case, is
someone who is operating in an environment conducive to expert intuition but
who may or may not have the necessary level of individual experience. Let's see
how far this point gets us in evaluating the answer choices. Choice (A) hits
precisely on what we just said. Choice (B) involves prior success, so it's off
the key point of experience and memory. Choice (C) is similar to (A) and shows
promise. Both choices (D) and (E) differentiate the presumed expert and the true
one by the regularity of the conditions, but we know the conditions to be
sufficiently regular, so they are out. We are left with (A) and (C). The
passage says that "it is incumbent on any true expert to know the limits of his
or knowledge" in lines 55-56. The author isn't claiming that the true expert
know everything, evidently, because there are "limits of his or her knowledge."
Therefore (C) is more appropriate than (A); according to the author, true
expertise entails knowing when one doesn't know enough. Not that this selection
does not bar the possibility that presumed experts may fail to be experts
because they have insufficient knowledge; rather, we have decided simply that
(C) better differentiates from a "true" expert, which, we can infer, is something
beyond a "normal" expert, since the author has used his last breath in this
passage to add an additional criterion to define "true" expertise.
The correct answer is (C).
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