The Great Wall of China was built during the Ming Dynasty by the army.Option B is correct.
The Great Wall of China as it is exists today was constructed mainly during the mighty Ming Dynasty. It constitutes an ancient series of walls and fortifications, more than 13,000 miles in length, located in northern China.
The Great Wall was built under thenrule of Emperor Qin Shi Huang in the third century B.C. in order to prevent incursions from barbarian nomads.