I don't think that the original question is about variable v2 also. At least that is not indicated in the question.
I remember that on the A320 there was something called a "variable kvs factor" and had to do with shifting v2 by pretendig to need a higher stall margine to increase v2 and therefore being able to pull out more weight in case of engine failure. That was the reason why even on very long RWYs we got rather small stopping margines. One would expect around 1500m+ on a 4000m RWY on a twin like the 320 but it was way less.
I doubt that this is the examn's question. On our EFB, the takeoff data calculation does show a v1 range, but always, alyways only one vr and one v2. Wether that v2 is "kvs factored", is not important, as there is no range to choose from.
So i beleive, aerocat and I agree, and do give the correct answer.
But who knows, thinking back on my examn, and how many wrong answers were the ones you had to check to get the points...
Nic