The emperor of the Sui Dynasty who was known for uniting China as one nation is "Wendi"
What is Sui Dynasty?
The Sui dynasty was a short-lived imperial dynasty of China of pivotal significance. The Sui unified the Northern and Southern dynasties, thus ending the long period of division following the fall of the Western Jin Dynasty.
The Emperor Wendi of Sui dynasty had the Great Wall repaired and extended towns to the borders of his empire. He extended the canal system between north and south China, which unified China and provided easier and quicker trading between the two areas.
Hence, option B is correct.
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