My issue is that the question didn't identify whether the sports drinks were going to be consumed pre or during event. Very unlikely post based on the stem but, if it were pre, then Hypertonic would be appropriate, if it were during, then both Iso and Hypo would be appropriate, I just don't see how they can say that one is more appropriate than the other, like, Hypo and Iso both rehydrate the athlete but during a 90 minute event it's not like they would need to top up on glycogen until after the game. Hyper during an event can cause gastric upset so it's very strange..
I can see your argument for hypotonic drinks. However, my thought process about sports drinks usually is along the lines of: "always isotonic unless there are extenuating circumstances". For example, if we were told that it was a hot day - hypotonic all the way. Hence, I selected isotonic as it would provide thee best balance of both fuel and fluid replenishment.
Also note that while we aren't crossing over to lipolysis dominance, we want to decrease the contribution from aerobic lipolysis as much as possible (aerobic lipolysis resynthesises ATP at a lower rate, hence lower intensity). So even though these team sports are usually under 90-120 minutes per match, we'd still want to top-up glycogen stores.