I think I've seen similar geography quizzes in one app. No, I'm not saying that's where you got it from. I just think all the quizzes are similar. However, I don't see the question from https://www.redlinels.com/countries-start-d/. I didn't immediately remember which countries except Denmark start with the letter D. I remembered from my school years that the Germans call their country Deutschland. But that answer didn't fit the answer in my quiz, so I started studying the map more often. I have an electronic atlas on my phone. Unfortunately, Americans often have trouble remembering European countries. I still don't remember all the names of African countries, and I'm embarrassed about that.