Physical features and environmental conditions primarily influence a region's . a. form of government
b. social class system
c. population distribution
d. religious beliefs

c. population distribution

Explanation:

The physical and environmental conditions of a region greatly influence the population distribution of a country. This is because it is these conditions that determine whether many needs of the population will be met.

When the physical and environmental conditions are able to supply the population's needs, it is common for this region to have a larger population distribution, on the other hand, when the physical and environmental conditions are not able to supply these needs, the population distribution is smaller.

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]