Final answer:
Liu Bang named himself the first emperor of the Han Dynasty in 202 BC. The Han Dynasty lasted for over four hundred years and had a centralized government and embraced Confucianism. Hence the correct answer is option A
Step-by-step explanation:
The emperor who named himself the first emperor of the Han Dynasty in 202 BC was Liu Bang. He established the Han Dynasty and became known as Emperor Gaozu. The Han Dynasty lasted for over four hundred years and was known for its centralized government, Confucianism as the official philosophy, and its development of trade routes.
Hence the correct answer is option A