Explanation:

The Communal Award was made by the British Prime Minister Ramsay MacDonald on 16 August 1932 granting separate electorates in India for the Forward Caste, Lower Caste, Muslims, Buddhists, Sikhs, Indian Christians, Anglo-Indians, Europeans and Untouchables (now known as the Dalits) etc.
The Poona Pact refers to an agreement between B. R. Ambedkar and M. K. Gandhi signed on 24 September 1932 at Yerwada Central Jail in Pune, India.
Third Round Table Conference was held in London on November 17, 1932.
On 8 August 1940, early in the Battle of Britain, the Viceroy of India, Lord Linlithgow, made the so-called August Offer, a fresh proposal promising the expansion of the Executive Council to include more Indians, the establishment of an advisory war council, giving full weight to minority opinion, and the recognition of Indians' right to frame their own constitution (after the end of the war).

The correct sequence is: Communal Award (D), Poona Pact (B), Third Round Table Conference (C), and August Offer (A). Therefore, option 2 (D, B, C, A) is the correct answer.