A is the most accurate description of Genghis Khan. A is correct, because Genghis Khan is said to have united many of the nomadic tribes of northeast Asia and is widely regarded as being the forefather of modern-day Mongolia and is highly regarded in Mongolia. Although he did bring all three cultures of the Silk Road under one cohesive political spectrum, he did not construct the famous trail. He also died shortly after a war campaign, but not during one. He never was an emperor of China either and had nothing to do with the Great Wall. These are all reasons why B, C and D are the incorrect answers, but A is.
