In which situation can an area's population remain almost stable?

Correct answer: Births, deaths, and migration are balanced

The correct answer is A: the population can remain almost stable when births, deaths, and migration balance one another. Population size changes when people are added through births and in-migration or removed through deaths and out-migration. If the total additions are nearly equal to the total reductions, the net change is close to zero, so the population remains almost stable. Option A is correct because it describes this balance. Option B is wrong because very high births and low deaths usually create a population increase, unless another factor offsets it. Option C is wrong because very high in-migration adds many people and generally increases population. Option D is wrong because very high out-migration removes many people and generally decreases population. “Almost stable” does not mean that no one is born, dies, enters, or leaves; it means the combined gains and losses are nearly equal. Memory cue: stable population means additions ≈ reductions, not zero movement.