According to which of the following sources, did Ashoka in his old age abdicate

Q. According to which of the following sources, did Ashoka in his old age abdicate the throne in favour of his grandson Samprati?
(a) Ashokavadana
(b) Divyavadana
(c) Mahavamsa
(d) Gargi-Samhita
Ans: (b) Divyavadana