In which condition can population remain stable?

Correct answer: Births and arrivals equal deaths and departures

The direct answer is A. Population remains stable when the number added to it equals the number removed from it. Additions include births and people arriving through in-migration. Removals include deaths and people leaving through out-migration. The idea can be written as: population change = births + in-migration − deaths − out-migration. If the additions and removals balance, net change is zero, so the total population stays the same. Option A is correct because it describes this exact balance. Option B is wrong because very high births and low deaths generally make the population increase. Option C is wrong because high in-migration adds people and usually increases population. Option D is wrong because everyone leaving would greatly reduce the population. Stability does not mean that nobody is born, dies, arrives, or leaves; it means the total gains and losses are equal. Memory cue: additions equal removals means stable population.