Answer:
In the pre-classical age (8000 B.C.E. to 600 B.C.E.) the first states developed in core civilizations. Then, powerful cities imposed their rule on surrounding areas through conquest and the first empires were born. In the classical age (600 B.C.E. to 600 C.E.) empires grew on a massive scale through territorial conquest with large armies. The growing scale of these empires, along with their increased ethnic and cultural diversity, required more sophisticated methods of governance. They served as major hubs of transregional networks of trade, and they diffused culture, religion, technologies and disease. As empires acquired massive wealth, the unequal distribution of this wealth across social classes placed enormous pressure on the political and social order. Eventually, all of the classical civilizations could not deal with the problems created by their own internal or external crises. In most cases, the belief systems spawned in these empires left enduring cultural footprints even as the empires' political structures disintegrated.
<span>The stars change position in the sky through the course of the night just like the sun changes position in the sky through the course of a day, they rise in the east and set in the west. If you were to start watching a star in the east at the beginning of the night and keep observing that same star for hours, you will see the star's position move across the sky and eventually drop below the western horizon. There some stars that don't rise and set through the night though. The stars near the celestial pole move in circles around the pole. There is one star in the sky that doesn't appear to move at all, because it is located in line with the Earth's axis of rotation, or in other words, on the celestial pole. This star is Polaris, or more commonly known as the North Star. The south celestial pole currently lacks a star so there is no southern hemisphere counterpart. In reality, Polaris isn't perfectly on the celestial pole so even it moves in a very small circle too small to be seen with the naked eye.</span>
The answer is:
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[C]: "<span>It can take several years to become fully trained."
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