Answer:
The correct answer is - A. Trade
Step-by-step explanation:
Darius the emperor of the Persian empire was the first Persian emperor to use a coin system for goods, services, and even for tax which makes his economy large and developed his empire, and created a new capaital. Darius used a gold minted coin system for trade for the goods and services and salaries to the army which made his empire popular and a large economy. His economy was a trade economy as coins were used for the different type of goods, foods and services.