Explanation, as narrated by Nightblade:
Career consultant: the most popular career advice suggests emphasizing one’s strengths to employers and downplaying one’s weaknesses. Research shows this advice to be incorrect. A study of 314 managers shows that those who use self-deprecating humor in front of their employees are more likely to be seen by them as even-handed, thoughtful, and concerned than are those who do not.
Old thought process: Show strengths
Consultant: Be self deprecating because it works for managers The careers consultant’s reasoning is most vulnerable to criticism on the grounds that it:
(A) Bases a conclusion about how one group will respond to self-deprecation on information about how a different group responds to it --
Bingo bango. So it works for one group, why is it that it would work for another? This is our answer, but we'll hold it for now to review the others(B) Ignores the possibility that what was viewed positively in the managers’ self-deprecating humor was the self-deprecation and not its humor --
This doesn't work. This still says that self-deprecation works, and that is what we are trying to disprove.(C) Ignores the possibility that non-self-depreciating humor might have been viewed even more positively than self-deprecating humor --
Interesting, but why do we care which is more positively viewed? We don't. (D) Infers from the fact that self-depreciating humor was viewed positively that non-humorous self-deprecation would not be viewed positively --
Another interesting answer. But why do care about non-humorous self deprecation? We do not. We care about non-deprecating actions, which this does not cover, so it is out of scope. Pay attention to the wording! (E) Bases a conclusion about a certain popular career advice on a critique of only one part of that advice --
The consultant doesn't critique the advice. She says there is a better way to go about things, but never says the ways in which the old way is inferior.