Explanation:

Sir Chettur Sankaran Nair

• Nair was known for being a passionate advocate for social reforms and a firm believer in the self-determination of India. 
• In 1897 he became the youngest president of the INC in the history of the party till then, and the only Malayali to hold the post ever. 
• In 1919, he played an important role in the expansion of provisions in the Montagu-Chelmsford reforms which introduced a system of dyarchy in the provinces and increased participation of Indians in the administration. 
• In Budasna v Fatima (1914), he passed a radical judgement when he ruled that those who converted to Hinduism cannot be treated as outcastes. In a few other cases, he upheld inter-caste and inter-religious marriages.
• Critique of Gandhi: Nair wrote ‘Gandhi and Anarchy’, which was published in 1922. In the book, Nair spelt out his critique of Gandhi’s methods, especially those of non-violence, civil disobedience and non-cooperation
• Massacre of Jallianwala Bagh: And when the massacre of Jallianwala Bagh happened, he resigned from the Viceroy’s Council in protest. Nair’s resignation shook the British government.
• Nair had accused O’Dwyer in his book, ‘Gandhi and anarchy’ for being responsible for the atrocities at the Jallianwala Bagh massacre. 
• Thereafter, O’Dwyer sued Nair for defamation in England. 
• A historic courtroom battle: The 12-member all-English jury was presided over by Justice Henry McCardie.
• Eventually, O’Dwyer won the case with a majority of 11 against one. The only dissenting judge was Harold Laski.
• Nair had lost the case and was held guilty for defaming O’Dwyer. He had to pay £500 and expense of the trial to the plaintiff.

Hence option 3rd is correct.