The set of environmental forces that consists of the demographic characteristics of the population and its culture is referred to as

Environmental determinism

Explanation:

This is a belief system that is based on the dominating environment that man is a product of the earth and as a product, he is dependent on the earth for his survival. This set of factors or forces led to the demographic characteristics of the population and set their culture. As man is guided by his/her instinct and its when the environment sets in motion it regulates the population characteristics such as there occupation, family size, and religion. This belief system allows the man to work on how he can make nature more productive for him and thus the concept of agriculture rises. As it can set his thought to action and thus help lead to formation of new characteristics.

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The answer might be c.