The connection between high population growth rates and the percentage of people under the age of 25 is typically that countries with high population growth rates tend to have a lower average age and a higher percentage of their population in younger age groups, including those under 25. This is often due to a combination of high birth rates and relatively lower life expectancies.
So, the correct answer would be:
A) Countries with a higher population growth rate also have a higher percentage of people under the age of 25.
In these countries, there are often higher fertility rates, which translates into a larger proportion of children and young adults in the population. Conversely, countries with lower population growth rates often experience an aging population, where the percentage of people over 65 increases, and the percentage of young people decreases.