The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
In order to run Persia more efficiently, the region was split into provinces. Each province paid a monthly tribute. This tribute can best be described as a contribution that the citizens of Persia or conquered towns had to make -voluntarily or involuntarily- to the King of Persia. Such as a gift or present that showed respect for the Emperor.
In ancient times, Cyrus the Great was the most important Emperor of Persia. In 559 BC he conquered many territories and expanded the Persian Empire. After him, Darius the Great kept on conquering and established a new capital for the Empire in Persepolis. After so many years of dominion and growth, this magnificent Empire came to an end after the loss of the Persians against Alexander the Great, in the Battle of Issus in 333 BC.
