In which situation can a city's population rise due to migration?

Correct answer: People from villages come to the city for jobs

Direct answer: Option A. A city’s population rises through migration when people enter the city from another place. In option A, villagers come to the city for employment, so they are in-migrants for the city. Step by step: employment attracts people; they leave their rural place; they settle or stay in the city; the city’s number of residents increases. This is also an example of rural-to-urban migration and may contribute to urbanisation. Option B is wrong because everyone leaving is out-migration and would reduce the city’s population. Option C is wrong because zero births and zero in-migration provide no stated source of increase. Option D is wrong because deaths greater than births cause natural decrease and no in-migration adds people to offset it. Memory cue: for a city to gain through migration, people must come in, not go out.