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I believe this should be a weaken question not flaw. Manhattan says its weaken too. Besides, the right answer choice E is giving a new cause- that of not being extroverted as a person OVER astrology affecting them.
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Apologies if I'm missing it, but which question are you referring to?
PrepTest 3 - December 1991 , Section 2, Q# 2.
The difference is often fairly arbitrary. You can turn any Weaken question into a Flaw question just by tagging “fails to consider the possibility that . . .” in front of each answer. So the distinction actually isn’t that important as long as you understand the question stem.
Reasonable minds may can disagree, but I think the question stem is pretty explicit in indicating the correct answer should indicate the flaw.