In each section, name any answer which applies the initial category to reveal the second category, then again use any answer which applies to each of the categories to reveal a third, and so on.
# = the number of answers possible. Answer must correspond to the highlighted yellow box.
Nice quiz. In the green category, I think Luxembourg also fulfils the criteria (Europe/below 9 million/below 6 million/part of EU/doesn't end in A or D).