A high birth rate combined with a rapidly declining death rate usually produces rapid population growth, often described as population explosion. When deaths fall because of improvements in sanitation, food supply, or healthcare while births remain high, the population increases quickly.
Stagnation, negative growth, and zero growth do not describe this imbalance. This pattern is often associated with the early stages of demographic transition, although its duration and intensity vary between regions.
Therefore population explosion is the most likely trend. For exam preparation, retain the defining feature and connect it to the named place, process, or concept. Read each option precisely: similar geographic terms can refer to different locations or mechanisms. This distinction helps apply the fact correctly rather than relying on vague recall.

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