The correct answer is option 'C', Muhammad Iqbal.

Muhammad Iqbal, also known as Allama Iqbal, was a renowned Urdu poet, philosopher, and politician from British India. He played a significant role in the Indian independence movement and is considered one of the most influential figures in Urdu literature.

During the British rule, the Round Table Conferences were a series of meetings held in London to discuss constitutional reforms and the future of India. The Second and Third Round Table Conferences took place in 1931 and 1932-33, respectively. These conferences aimed to gather representatives from different communities and political parties to address the issues faced by India and find a solution.

Muhammad Iqbal was invited to both the Second and Third Round Table Conferences as a representative of the All India Muslim League. The Muslim League was one of the major political parties advocating for the rights and interests of the Muslims in British India.

Iqbal's presence at these conferences was highly significant as he was not only a poet but also a prominent intellectual and political leader. His philosophical and political ideas had a profound impact on shaping the vision of a separate Muslim homeland, which later led to the creation of Pakistan.

During the Round Table Conferences, Iqbal actively participated in the discussions and presented the demands of the Muslim community. He emphasized the need for safeguarding the rights of Muslims and protecting their cultural and religious identity within the framework of a united India.

Iqbal's speeches and writings during the conferences were highly influential and helped in shaping the political discourse surrounding the Muslim community's aspirations. His vision of a separate Muslim state eventually led to the formation of Pakistan in 1947.

In conclusion, Muhammad Iqbal, the eminent Urdu poet, was invited to the Second and Third Round Table Conferences as a representative of the All India Muslim League. His presence and contributions at these conferences played a crucial role in advocating for the rights and interests of the Muslim community in British India.