The correct answer is: A) E.V. Ramasamy (Periyar)
E.V. Ramasamy (Periyar) was a social reformer and politician who led the famous Vaikom Satyagraha against untouchability in 1924. The Vaikom Satyagraha was a nonviolent protest against the practice of untouchability in the Vaikom temple in Kerala, India. The protest lasted for 12 days and was successful in gaining access to the temple for all people, regardless of caste.
Sree Narayana Guru was a social reformer and philosopher who also worked to improve the lives of Dalits. However, he did not lead the Vaikom Satyagraha. T.K. Madhavan was a lawyer and politician who was involved in the Vaikom Satyagraha, but he was not the leader. Mahatma Gandhi was a leader of the Indian independence movement who also supported the cause of Dalits, but he was not involved in the Vaikom Satyagraha.
The Vaikom Satyagraha was a significant event in the history of the struggle against untouchability in India. It helped to raise awareness of the issue and to bring about positive change.