Which example shows migration-based change?

Correct answer: People coming to a city for work

The correct answer is C: people coming to a city for work. Migration-based change occurs when people move from one place to another. In this example, workers enter the city, so it is in-migration and may increase the city’s population. A is a natural-change factor because it concerns births. B is also related to natural change because a lower death rate affects the difference between births and deaths. D is a health and mortality factor, not movement between places. The key test is to ask whether the example describes people crossing from a source area to a destination area. If yes, it is migration; if it describes births or deaths, it belongs to natural change. Memory cue: movement means migration; birth and death statistics describe natural change. The city may also face greater demand for housing, transport and services after receiving workers.