Between 1750 and 2000, which development was most important for the global population increase?

• A. Improvements in techniques to produce goods cheaply in large quantities
• B. Advances in medicine, public health, and food storage
• C. Population movement from developing to developed countries
• D. Improvements in techniques used to extract energy resources

Answer: (B)

The key idea is that population growth over this period mainly comes from fewer deaths thanks to advances that directly protect people's health and provide reliable food. Medicine and vaccines reduced deaths from infectious diseases, antibiotics later cut mortality from bacterial infections, and overall medical knowledge improved survival in both children and adults. Public health measures—clean drinking water, sewer systems, improved sanitation, and better nutrition—helped prevent outbreaks and lowered child mortality, so more people lived longer. Food storage and preservation meant people didn’t starve as easily during bad harvests, improving nutrition and stability in food supplies, which also supported higher survival, especially for infants and young children.

These health and food advances directly affect how many people can live long enough to reproduce, driving large-scale population increases. In contrast, making production cheaper, moving people around, or extracting energy resources influence economies, trade, and where people live, but they don't by themselves raise the number of people on the planet as powerfully or consistently as health improvements and food security do.