The correct answer is option 3, Sarojini Naidu. The Second Round Table Conference was held in London in 1931, and it aimed to discuss constitutional reforms for India. Sarojini Naidu, also known as the Nightingale of India, was a prominent freedom fighter and poet. She was chosen to represent India at the conference due to her leadership role in the Indian National Congress and her reputation as a fervent advocate for women`s rights and Indian independence. Naidu actively participated in the discussions at the conference, voicing the demands and aspirations of the Indian people. Her presence at the conference helped bring attention to the Indian cause and paved the way for future negotiations regarding India`s self-governance.