Hey everyone, thanks for all of the feedback. I am sorry that I got a lot of the answers wrong and appreciate you guys pointing them out. I will update all of the answers soon!
France and Germany are correct. There are various ways of counting, of course, and Marseilles is pretty close in size to Lyons, but I don't know of any way of counting that makes Munich (presumably?) larger than Hamburg.
And Munich's metro area is larger than Hamburg's, but counting city proper and urban area, Hamburg is larger.
So you can name either I guess, so long as you are consistent in your methodology, though I have always heard that Marseille and Munich are bigger.
It is pretty far away from the border to Montenegro and there is no major city of that name there.
And I agree with the other comments that Bosnia is totally wrong and the given answer is not even a city.