The correct options are
A The tax system
B Trade policies
C War strategies
Arthashastra was written by Kautilya, the teacher and guardian of emperor Chandragupta Maurya. It is a detailed text about how to run a state, such as the duties of a king, criteria for selecting a minister, systems of defence, types of forts, the formation of an army, plans for espionage, organization of the treasury and other offices, the judicial system, investigation of theft, types of punishment, and many other governing ideas.