The 'Population Explosion' happens in which of the following stages?

Second stage

The correct answer is Option (3) → Second stage

The "Population Explosion" occurs during the Second stage of the demographic transition model.

In this stage, a country's death rate begins to fall sharply due to improvements in healthcare, sanitation, and food supply. However, the birth rate remains high because of social and cultural factors that take longer to change. This widening gap between high birth rates and rapidly falling death rates leads to a period of very rapid population growth, which is often referred to as a "population explosion."