Answer:
D. Developing countries are just beginning to experience improved food production and health services.
Explanation:
When developing countries begin to industrialize, it means that the economy is growing. This also means that the people's income is rising, thus their means of living is also becoming more sophisticated. This means they are beginning to experience an improve food production due to the new industries and they could avail of improved health services as well. Such situation attracts many people into staying in the country and having a family, thus, the population rate increases.
However, those people living in already-industrialized countries are more prone to stress and are easily swayed by fatty foods, alcohol, drugs and even killing one's self. This affects the population rate.