To solve this question, the user needs to have knowledge of the Indian epic, Mahabharata. The Rajasuya Yagna is a significant event in the epic, and Bheema plays a key role in it.

Now, let's go through each option and explain why it is right or wrong:

A. Kritavarma: This option is incorrect because Bheema did not defeat Kritavarma to enable Yudhistra to perform the Rajasuya Yagna. Kritavarma was a Yadava prince and a friend of Krishna who fought on the side of the Kauravas in the Kurukshetra War.

B. Shishupala: This option is incorrect because Bheema did not defeat Shishupala to enable Yudhistra to perform the Rajasuya Yagna. Shishupala was a king of the Chedi kingdom and a cousin of Krishna who was slain by him at the event.

C. Jarasandha: This option is correct. Bheema defeated Jarasandha, the king of Magadha, to enable Yudhistra to perform the Rajasuya Yagna. Jarasandha was a powerful king who had defeated many other kings in battle and had imprisoned them. In the epic, Bheema fights a long and grueling battle with Jarasandha and finally defeats him by tearing him in half with his bare hands.

D. None of the above: This option is incorrect because option C, Jarasandha, is the correct answer.

The Answer is: C