What major accomplishment was achieved by Darius | of Persia?

A) the introduction of democracy in Greece

B) the institution of a single language for government

C) the conquest of China

D) ending the practiced slavery throughout the empire

The correct option is: B

Dario I was the third king of the Achaemenid dynasty of Persia from the year 521 to 486 a. C., inherited the Persian Empire at its zenith; including the Iranian territories, Elam, Mesopotamia, Syria, Egypt, the north of India and the Greek colonies of Asia Minor.

Among his achievements, the administrative and financial reform of the State stands out; divided the conquered territory into satrapies, assigning its management to a powerful governor, with wide powers, the satrap. He implanted a unified monetary system, organized the traditional legal codes of Egypt, for which Diodoro Sículo called him "the last legislator of Egypt" and made Aramaic the administrative language of the western regions of the empire.