Why can slums increase in cities because of migration?

Correct answer: Housing and services may not expand as quickly as the incoming population

Correct answer: A, housing and services may not expand as quickly as the incoming population. Migration, especially rapid in-migration, brings additional people to a city in a relatively short period. These people need affordable homes, water, sanitation, transport, schools, health care and employment. If formal housing and public services do not grow at the same pace, many low-income migrants may have to live in crowded, unsafe or poorly serviced settlements. Such settlements may develop into slums. B would reduce the number of people in the city, so it does not explain an increase in slums. C is unrelated because a zero birth rate does not itself create slums through migration. D does not describe the main cause; a higher death rate would not create the housing pressure described here. The memory cue is: rapid arrival plus limited affordable housing creates urban pressure.