Answer:
The answer is C.
Explanation:
It is tangible boundaries (C) because these are natural/physical limitations. The other answers would mean that they were marked or created by humans.
A "theocracy" is run by religious and political leaders, whereas a "patriarchy" is run by men only, although it should be noted that the two are not mutually exclusive in the sense that it would be possible to have a theocracy run by only men.
The factors which lead to the rise of feudalism was the fact that people couldn't protect themselves and needed land where they could be safe considering the fact that a single peasant didn't have enough capabilities to defend himself. This lead to the fact that these peasants had to give food and goods to their lord with his army.
