D. Democratic Government
Democracy is the most popular form of government in the contemporary world. Over a hundred countries today claim and practice some kind of democratic politics.
The source passage from Chapter 5 explicitly states: "Over a hundred countries of the world today claim and practice some kind of democratic politics." This makes Option D the correct answer. The passage also notes that democracy is considered better than dictatorship, military rule, or rule by monarchy — eliminating options A, B, and C. In MCQs like this, look for direct textual evidence from the chapter to support your choice.