Hi all --
Important consideration here: Collective nouns are almost always singular in American English. The use of the plural with a collective noun sounds completely foreign to this American ear! This was discussed some time ago over here and we're pretty sure it still applies -- see the 4th comment in particular (can't say that the GMAT still has not ever used the "collective noun/plural" on an actual problem but it's good to note):
https://www.manhattangmat.com/forums/sc- ... t3514.html
Also, in the example being discussed in this thread, it should be "amongst" not "among" - and, we can't say for sure that the plural is correct or not in that second one!
We would be willing to bet money that a statement like "The committee were fighting over some issues" would NEVER be found on a GMAT problem. Even doubtful that the modified "The committee were fighting amongst themselves" would show up... but we're no expert.
EssaySnark