Ordering by location was enough to pass the tests on this (having just completed it). I will say I experienced frustrations with the vagueness around it though. The order by criteria was unclear. When it says "Order by US and then EU sales", my first thought is US sales highest to lowest, and then EU sales, highest to lowest. This was not the case. Simply ordering by location was enough, and it was fairly frustrating to see tests/attempts come back as a failure I was also ordering by price. I would suggest changing it to say "Order by US and then EU locations" rather than sales.