What was an accomplishment by the tang dynasty of china?
the tang rulers created the first paper currency in history.
the tang rulers defeated kublai khan after a long war.
the tang rulers expanded into the mongol empire.
the tang rulers established a system of coinage.

The correct option is: "The Tang rulers established a system of coinage."

The Tang dynasty was the successor of the Sui dynasty and predecessor of the period of the Five Dynasties and the Ten Kingdoms in China. The dynasty was interrupted by the second Zhou dynasty when Empress Wu Zetian usurped the throne and founded her own dynasty. The Tang dynasty, with its capital in Chang'an (present-day Xi'an), the most populous city in the world at that time, is considered by historians as a moment of splendor of Chinese civilization, equal to -or even superior- to of the Han period.

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