In which condition can the same in-migration become an urban problem?

Correct answer: When housing, services and jobs are insufficient

Direct answer: Option B. In-migration increases the number of people living in the receiving city. If housing, water, sanitation, transport, schools, health facilities and jobs do not grow enough to meet this additional demand, the city may face overcrowding, informal settlements, unemployment and pressure on infrastructure. Option B is correct because insufficient facilities make it difficult to absorb newcomers safely and productively. Option A is wrong because adequate housing, services and employment help manage migration rather than create a problem. Option C is generally not the best answer because a very small inflow is less likely to create major citywide pressure. Option D is wrong because natural increase being zero does not remove the effect of people arriving from elsewhere. The key comparison is between the size of in-migration and the receiving city’s capacity. Memory cue: migration is beneficial or problematic partly according to whether urban capacity keeps pace with arrivals.