Explanation:

Here's an explanation for each option regarding legal defense in the Chauri Chaura incident:

- Option 1: C. R. Das

- C. R. Das was a prominent lawyer and politician but was not involved in the legal defense for Chauri Chaura.

- Option 2: Madan Mohan Malaviya and Krishna Kant

- Correct Answer: Madan Mohan Malaviya, along with his assistant Krishna Kant, provided legal defense for those arrested after the Chauri Chaura incident.

- Option 3: Dr. Saifuddin Kitchlew and Khwaja Hasan Nizami

- They were involved in different nationalistic struggles but not specifically in the legal defense post-Chauri Chaura.

- Option 4: M. A. Jinnah

- Jinnah was a barrister involved in political and legal matters but did not defend those arrested in this incident.