Correct Answer: (d) the Indica of Megasthenes
Solution:Megasthenes divided Mauryan society into seven categories which are as follows :
(1) Philosophers (2) Farmers (3) Herdsmen (4) Artisans (5) Military (Soldier) (6) Overseers or Spies (7) Councillors and Assessors. Megasthenese does not mention slavery in India. According to him, no one could marry outside his caste, and no one could take to an occupation from the one fixed for his caste according to the varnasystem.