I believe the correct answer from the choices listed above is option D. A person migrates from a developed nation to a developing nation is an example of urbanization. It is the gradual increase in the proportion of people living in urban areas. Hope this answers the question.
Which of these events is an example of urbanization? A. A city planner decides to build houses instead of apartments. B. A family sells its farm and moves to a large city. C. A leader forces citizens from the eastern part of a city to move to the western part. D. A person migrates from a developed nation to a developing nation.