Which two of the four kings listed below were on friendly term

Q. Which two of the four kings listed below were on friendly term equally with Vardhamana Mahavir and Gautama Buddha?

1. Bibisara of Magadha

2. Ajatasatru of Magadha

3. Prasenjit of Kosala

4. Pradyota of Avanti

(a) 1 and 3

(b) 3 and 4

(c) 1 and 4

(d) 2 and 3

Ans: (c) 1 and 4