Impressive. I would have aced it too, but I couldn't figure out the anagram for TTOOORN. That's the only reason I didn't get it.
I was able to recognize that the other three were anagrams of the names of cities, and assumed that that was what they had in common. Not being able to recognize the third one, I assumed it was different.
I now assume that the third one is also the name of a city, in America, and that Copenhagen Is the odd one, because it is not in America. I still have no clue what TTOOORN is supposed to be, but if I had recognized it, I'm sure I would have got this question right, for 100%.