Explanation:

- Ajatshatru: He is historically referred to as "Pitrihanat," which means "the killer of the father." He killed his father, King Bimbisara, to ascend the throne.

- Avail: Correct Answer

- Chandragupta Maurya: He was the founder of the Maurya Empire but is not associated with the term "Pitrihanat."

- Bimbisara: He was a king of the Haryanka dynasty in Magadha and the father of Ajatshatru, but he isn't known as "Pitrihanat."

- Ashoka: A Mauryan emperor known for his conversion to Buddhism and efforts to spread peace, not linked to "Pitrihanat."