The correct answer is option 'D' - II Round Table Conference. Let's delve into the details of the conference and the context behind it.

II Round Table Conference:
The II Round Table Conference was held in London from September 7 to December 1, 1931. It was organized by the British government to discuss constitutional reforms in India. The conference aimed to bring together representatives from various Indian communities and political parties to find a solution to the constitutional issues faced by India.

Context:
During the early 20th century, India was striving for independence from British colonial rule. Different political leaders had varying approaches and ideologies regarding the path to independence. The relationship between Mahatma Gandhi and M.A. Jinnah, two prominent figures in the Indian independence movement, was complex and marked by ideological differences.

Gandhi and Jinnah:
Gandhi, known for his non-violent resistance and philosophy of Satyagraha, advocated for a united India where Hindus and Muslims would coexist peacefully. On the other hand, Jinnah, a Muslim leader, believed in the creation of a separate nation for Muslims, which eventually led to the formation of Pakistan.

Gandhi's Efforts at II Round Table Conference:
At the II Round Table Conference, Gandhi represented the Indian National Congress (INC) and put forth the Congress demand for complete independence (Purna Swaraj). However, his participation was conditional on the inclusion of M.A. Jinnah, who represented the All India Muslim League (AIML), in the discussions.

Gandhi aimed to win over Jinnah and convince him to support the Congress demand for independence. He recognized the importance of Muslim representation and sought to bridge the gap between Hindus and Muslims in the fight for freedom. Gandhi believed that a united front was crucial for the success of the independence movement.

Outcome:
Unfortunately, Gandhi's efforts to win over Jinnah were not successful during the II Round Table Conference. Jinnah remained steadfast in his demand for a separate Muslim nation and did not support the Congress demand for complete independence.

However, the II Round Table Conference played a significant role in shaping the political landscape of India. It highlighted the diverse opinions and aspirations of different communities and parties, paving the way for future negotiations and discussions on the future of India's governance.

In conclusion, Gandhi's attempt to win over M.A. Jinnah took place at the II Round Table Conference, where he aimed to bridge the gap between Hindus and Muslims in the fight for independence. Although his efforts were not fruitful, the conference played a crucial role in shaping the political discourse in India.