Answer - C - The Great Wall was built during the Qin dynasty in China.
Key Takeaway: The Great Wall of China is a series of stone fortifications in northern China that were built, rebuilt, and maintained between the 5th and the 16th centuries to protect the Chinese Empire during various dynasties. Since the 5th century, many walls have actually been built that were called the Great Wall. One of the most famous is the wall built between 220-206 by the first Emperor of China, Qin Shi Huang. Little of that wall remains. The majority of the existing wall was built during the Ming Dynasty.