The correct answer is D. Mongol Empire
Step-by-step explanation:
The Mogol Empire is commonly known as the largest empire that ever existed. This empire began around the 13th century, which is part of the post-classical era (500 A.D. to 14th century), in Mongolia, Asia. but soon expanded to other areas. Indeed by the end of the 13th century, the empire covered around 24,000,000 kilometers including most Asia limiting with Siberia and the Indian subcontinent and Eastern Europe. This means the Mongol Empire included the modern territories of China, Mongolia, Afghanistan, Armenia, Cambodia, part of India, and Russia, among others. Thus, the one the postclassical empire that covered the largest geographic territory was the Mongol Empire.