Answer:
option A
Step-by-step explanation:
The correct answer is option A
Yang Chien’s Sui dynasty was from 581 and ended in 618, it only remains for 38 years.
The biggest achievement of Yang Chien’s Sui dynasty was that they were able to reunify China, ending the period of Disunion.
The emperor of the dynasty consolidated their control over unified china and they expanded there territory.
Under there rule, they have a very improved and centralized administrative system which was very beneficial for the unification of China.