Which one of the following statements about ancient Indian Mahajanapadas is correct?

Q. Which one of the following statements about ancient Indian Mahajanapadas is correct?

(a) All Mahajanapadas were oligarchies where power was exercised by a group of people

(b) All Mahajanapadas were located in Eastern India

(c) No army was maintained by the Mahajanapadas

(d) Buddhist and Jaina texts list sixteen Mahajanapadas

Ans: (d) Buddhist and Jaina texts list sixteen Mahajanapadas