In which situation can the effect of population growth appear different locally from the national average?

Correct answer: In-migration is very high in an industrial city

The direct answer is A. A national average combines the experiences of many different places, so it can hide strong local differences. An industrial city may attract workers and their families from other regions. This in-migration can make its population grow rapidly even if the national growth rate is moderate or declining. First identify the scale of the statistic: national or local. Then identify the local processes, especially births, deaths and migration. A is correct because heavy in-migration directly changes the city’s population and can make its growth unlike the national average. B would make local rates alike, not different. C describes an empty area and does not provide a meaningful comparison. D makes measurement difficult but does not itself create a different growth pattern. Memory cue: averages describe the whole; migration can make one place unusual.