Nice quiz. The Swiss map was a bit confusing, although the only possible "I" answer had to be "Italian". Italian is official in both Ticino and Graubünden, but is only widely spoken in the areas marked dark blue on the map. If the map's key had shown the dark blue area to be "Official and Prominent" that would have removed any confusion.
Maybe use https://en.wikipedia.org/wiki/Languages_of_Switzerland#/media/File:Switzerland_Linguistic_EN.png and say "the green language", or something like that?