The Agrarian Era is one of the most important points in the human history and development. In this era, the humans changed their lifestyle from nomadic to settled one because they were able to produce surplus of food. This resulted in great and rapid development and progress of the human societies. As the humans had much more spare time, they started to occupy themselves with lot of other things, such as science, arts, building, resulting in an explosion of inventions and advancements in a very short period of time, and the process was constantly accelerating and the human kind was moving forward quicker and quicker.
I would like to say C, because they were imperialistic power who sought out many colonies through out the world and they were heavily militaristic about these colonies. But I would wait for a second answer before you choose C, as I am unsure of this.
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Beavers might be the most well-known animal architects, and with good reason. These prolific builders fell trees and gather sticks and mud to construct dams, which create ponds that offer predator protection and easy access to food during the winter.