For answer C, if we're taking "the sweetness of sugared beverages makes athletes more likely to drink them" as true, how could answer C "Dehydrated athletes find beverages containing large amounts of sugar to be too sweet" be true?

Is this just due to the distinction between athletes and dehydrated athletes?

Really hung up on the intentionality piece for question 2. If "actual communities are 'nonintentional'", I have a tough time seeing the author agreeing that political/religious group membership constitutes a nonintentional community.