Which of the following books is the primary source containing 15 books (Adhikaranas) on ancient internal administration, security, diplomacy, and economics?
The Arthashastra was composed by Chanakya (Kautilya/Vishnugupta), the prime minister of Chandragupta Maurya. It outlines statecraft, military strategy, and economic policy. [Memory Trick: To manage a kingdom's balance sheet, you need 'Artha' (wealth/economy) science = 'Arthashastra'.]