Even with a total fertility rate of 2.1,some countries may experience continued increase in the number of people due to _______.

Question

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Population or demographic momentum refers to the tendency for population growth to continue even after replacement-level fertility has been achieved, due to a large cohort of young people entering reproductive age. This can result in continued population growth even with a total fertility rate of 2.1. High birth rates and low death rates (A) can also contribute to population growth, but they are not necessarily linked to a TFR of 2.1. Lack of contraception available for women (B) may increase fertility rates, but it is unlikely to be the sole cause of continued population growth in a country with a TFR of 2.1. Government intervention or family planning (D) can help reduce fertility rates and population growth, but this is not relevant to the question of why some countries may experience continued growth with a TFR of 2.1.

Even with a Total Fertility Rate of 2