03. From A Kingdom To An Empire
Explanation:
Centralized Chandragupta's rule was a carefully organized bureaucratic system. The empire built infrastructure such as irrigation, temples, mines, and roads, leading to a strong economy. Through this centralized authority, which included a powerful military, the rulers of the empire bound together the previously fractured regions of the Indian Subcontinent. Kautilya's arthashastra, produced during this time gave details on how to rule a kingdom and informed about special cadre of officers to run the administration.