Demographers developed a hypothesis to explain the changes to the populations of countries over time. This hypothesis describes a demographic transition, in which countries change from a combination of high birthrates and high death rates to low birthrates and low deathrates. The changes of the demographic transition are summarized in the graph. Birth rate and death rate are plotted against time. At first (Stage 1) both rates are high. Then in Stage 2, birth rate remains high while death rate decreases. In Stage 3, birth rate decreases to match the low death rate. Which of these events is most likely to occur during Stage II of the demographic transition? A. The population decreases slightly, especially in the younger age ranges. B. The population decreases slightly, especially in the older age ranges. C. The population increases slightly, due mainly to the increased rate that babies are born. D. The population increases significantly, due mainly to a decrease in death