The Indian National Congress did not take part in which Round Table Conference?

The Indian National Congress did not take part in the First Round Table Conference, which was held in London from November 1930 to January 1931. At this time, the Congress was engaged in the Civil Disobedience Movement under Mahatma Gandhi and demanded 'Purna Swaraj' (complete independence), leading to their boycott. Mahatma Gandhi, representing the Congress, famously attended only the Second Round Table Conference. Therefore, options B, C, and D are incorrect as they either state participation or incorrectly combine conferences.