During which of the four stages of demographic transition shown below does the population grow the most rapidly? 
Definitions:
Free-Radical Theory
A theory suggesting that organisms age due to cells accumulating free radical damage over time.
Hormonal Stress Theory
The theory that stress increases the secretion of certain hormones, which can affect physiological and psychological states.
Cross-Sectional Study
A research method that involves analyzing data collected from a population, or a representative subset, at a specific point in time.
Longitudinal Study
A research design where the same subjects are observed or tested repeatedly over a period of time, allowing for the examination of changes and continuities.
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