To answer this question, the user needs to have knowledge of Indian mythology and the Mahabharata epic.

Explanation for each option:

A. Duryodhana's father-in-law: Beeshmaka was not Duryodhana's father-in-law. Duryodhana's father-in-law was King Jarasandha of Magadha.

B. Jayadratha's father-in-law: Beeshmaka was not Jayadratha's father-in-law. Jayadratha's father-in-law was King Dhrishtaketu.

C. Krishna's father-in-law: Beeshmaka was the father of Rukmini, who was one of Lord Krishna's wives. So, Beeshmaka was Krishna's father-in-law.

D. Arjuna's father-in-law: Beeshmaka was not Arjuna's father-in-law. Arjuna's father-in-law was King Virata.

Therefore, the correct answer is:

The Answer is: C. Krishna's father-in-law.