Answer:
Option A
Step-by-step explanation:
In early days of China, the belief of Confucianism was prevailing that later disillusioned (disappointed) people and was unable to keep order in China and following this the empire of China broke into smaller pieces. People got embraced with Buddhism, a new religion as it believes on "end to suffering"
Later on, Buddhism was officially made the one and only belief system of China.
Hence, option A is correct