Which physical factor includes community size as a variable?

• A. Community size
• B. Geography
• C. Industrial development
• D. Climate

Answer: (A)

This question hinges on how population characteristics shape environmental exposure. In environmental health, physical factors are aspects of the environment that influence risk, including the size and density of the population living in a given area. Community size directly defines how many people occupy a space, which affects contact rates, crowding, demand on resources, and the scale of exposure to hazards. Larger communities tend to have different transmission dynamics, infrastructure needs, and environmental pressures than smaller ones, simply because the number of people is different. Geography, climate, and industrial development describe separate aspects of the physical environment that influence risk in other ways, but they do not specify population size as the variable. Therefore, community size is the factor that includes population size as the variable.