Hey everyone, I see this quiz is getting spotlighted. I also see now that there is a featured quiz with this same topic. I didn't know that when I made it. Nevertheless, mine is slightly different, so I'll keep it up.
Technically speaking Greenland is not part of Europe, so adding Denmark as an answer was bit confusing. I don't think that territories outside continent that country is in should count as part of continent (aka Greenland in Europe). If you wanted to include Greenland as part of Denmark then it would be more logical to put it in North America - in that case Denmark (Greenland) would consist of little less than 9% of North American area.