4 Emperor Qin A invented a written language. B built the Great Wall of China. C established a single currency. D was remembered by his people.

Решение:

В тексте упоминается: "Qin Shi Huang... During his reign he brought the different states of China together to form the first Chinese Empire and he made the written language, the money and the laws the same for everyone." Из этого следует, что он установил единую письменность, валюту и законы.

Ответ: C