by Dkrajewski30 Thu Aug 15, 2013 7:08 pm
I see why C is correct, because if there's no groupthink among groups where there's rampant distrust - in other words, no groupthink in non-cohesive groups as cohesive groups contain very little distrust, if any - then this consideration strengthens the claim that cohesion is necessary for groupthink. If it were not necessary for groupthink, then you'd expect there to be cases where groupthink occurs in a non-cohesive group. Yet extensive research showed no such cases of this? Then it's reasonable to suspect that cohesion is needed for groupthink to occur.
However, on its face, I don't see why B is wrong, as I think B also strengthens the author's claim about cohesion being necessary for groupthink but not sufficient for groupthink.
Here's why: I think B strengthens the claim that groupthink is not sufficient on its own to bring about groupthink. If there's good reason to think that respectful dissent is more likely to occur in cohesive groups than some other groups, then this shows, indeed, that cohesion is not sufficient for groupthink. After all, if cohesion were sufficient for groupthink, then you wouldn't expect dissent to be more likely in such groups than some others, as dissent seems to prevent a group from obtaining the 'disease' of groupthink. So while C strengthens the 'cohesion is necessary' part, B strengthens the 'cohesion is not sufficient' part of the author's claim.
That said, I do think C is a better answer than B. So I'm going to play devil's advocate to my alternative choice and try to discount it all together.
It's never stated either implicitly or explicitly that dissent cannot occur either in groups suffering from groupthink or in cohesive groups. If many groups with groupthink and/or cohesion have some dissent going on in them - respectful dissent nevertheless and not rude dissent - does this strengthen the idea that cohesion isn't sufficient? Now I don't think it does. Couldn't it be the case that dissent occurs in a group w/ groupthink here and there? Would the fact that dissent occurs mean that the group doesn't suffer from groupthink? Well, we've got no reason to think that given the passage. As stated, there's nothing in the passage to suggest that dissent is incompatible with cohesion and/or groupthink. So then if that's true, and dissent is compatible with both things, then B doesn't strengthen the claim that cohesion isn't sufficient for groupthink. Because so what if cohesive groups are more likely to have dissenters than some other groups? Having dissenters does not preclude them from becoming 'groupthinkers'. And so cohesion still could be sufficient for groupthink as dissent doesn't prevent that from being so. (Conceivably, too much dissent may preclude a group from cohesion and/or groupthink, and it's actually only a small amount of dissent that's compatible with both things. Either way, the passage doesn't necessarily support such an interpretation.)