Your source doesn't assign a rank to every country. Consider Monaco, an unranked country that your source says has a population density of 19348 people per square kilometer. Since there are 100 hectares per square kilometer, that's 193 people per hectare, which translates to 0.0052 hectares per person. Its hectares of *arable* land per person is necessarily lower than that, so it deserves to be on the list in this quiz.