Concept:Developed countries often face low birth rates, causing population growth that is too slow to replace the existing population.Explanation:Many developed countries today record birth rates below the replacement level needed to keep population size stable.This leads to a very slow replacement rate, aging populations, and potential population decline.Overpopulation and high death rates are not typical problems of developed countries, while high dependency ratio is more common in developing countries due to many children.Answer:A. very slow replacement rate