In which situation can a falling death rate make population change grow faster?

Correct answer: When the birth rate is still fairly high

The direct answer is A. Natural increase is the difference between the birth rate and the death rate. If the death rate falls while the birth rate remains fairly high, fewer people are being removed from the population and many people are still being added through births. The gap between births and deaths therefore becomes larger, so natural increase can grow faster. Option A states this necessary combination. Option B is wrong because a zero birth rate cannot create a positive natural increase merely through a falling death rate. Option C describes out-migration, which reduces population and is not the stated condition for natural increase. Option D is not a meaningful situation for population growth because a population must exist for births, deaths and rates to be measured. A falling death rate alone does not always guarantee rapid growth; its effect must be considered together with the birth rate. Memory cue: growth is strongest when additions remain high while removals fall.