This took me 10 minutes to get, because I kept going over the grammar and was flummoxed. But I got it! And JY's explanation made me LOL, because I was wondering for a minute if Pat was an entitled jerk who just insisted on getting the coupon where she wanted to get it.

I really don't understand why C doesn't work, even after the explanation. The assumption can still be true but the conclusion false -- why is this wrong?

"Given that the definition of "most" is "half plus one," the two scoops from A must overlap by at least one member. That one member transfers to B and to C. That necessarily creates an overlap between B and C."

What the heck does this mean?