The correct answer is option 4, Ramsay Macdonald. Ramsay Macdonald, who was the Prime Minister of the United Kingdom at that time, chaired the first Round Table Conference. The Round Table Conferences were a series of discussions held in London in 1930-1932 to address constitutional reforms and the future of British India. These conferences aimed to bring together representatives from different political parties and communities in India to find a solution for achieving self-government. Ramsay Macdonald played a significant role in leading these discussions and facilitating dialogue between the various stakeholders. It`s important to note that Clement Attlee, Winston Churchill, and Stanley Baldwin were also prominent political figures in the United Kingdom, but they did not chair the first Round Table Conference.