In which situation will total population decline even though the birth rate cannot be called completely low?

Correct answer: When the birth rate is moderate but deaths and out-migration are high

Direct answer: A is correct. Total population does not depend on the birth rate alone. A population can have a moderate or reasonable number of births and still decline if the number of deaths and people leaving the area is greater than the number of births and people entering it. In simple terms, total change equals births plus in-migration minus deaths minus out-migration. In option A, high deaths and high out-migration can make the final balance negative even though the birth rate is not extremely low. Option B is internally unsuitable because if births and deaths are both zero, the population would not decline unless another component, such as out-migration, were present. Option C is likely to increase population, not reduce it, if other factors are unchanged. Option D generally removes one source of decline. The exact result depends on the size of every component, but A is the only option that provides a clear mechanism for decline without requiring a very low birth rate. Memory cue: population can fall because departures and deaths outweigh births and arrivals.