Easy
Identify the correct pair from among the following.
Bimbisara founded/belonged to the Haryanka dynasty of Magadha. Ajatashatru and Kalashokan belonged to the Haryanka/Shishunaga lines, not Mauryan; Shishunaga founded the Shishunaga dynasty, not Nanda.
Re-check your working by substituting the answer back into the original question.