Just ARGUE. That’s all you have to do.
The conclusion in Question #5, Section 3 of the June 2007 LSAT is “the ants were not bringing food to their neighbors.” The evidence is “the ants were emptying their own colony’s dumping site.” The problem with this logic is that it’s possible that the ants were feeding their garbage to their neighbors.
That’s nasty, but it’s possible. If it were true, the argument would make no sense. Since I’ve identified the huge hole in the argument, I’ve already answered the question–even though I haven’t seen what the question actually asks yet.