The correct answer is option 1 - Kerala. The Vaikom Satyagraha was a nonviolent protest that took place from 1924 to 1925 in the town of Vaikom, Kerala. It was one of the most significant events in the history of the Indian independence movement. The satyagraha was a protest against the practice of untouchability and discrimination faced by lower-caste Hindus who were not allowed to enter the Sri Mahadeva Temple in Vaikom. Led by social reformers like K. Kelappan and T.K. Madhavan, people from different castes actively participated in the protest, demanding the right for lower-caste Hindus to enter the temple. The Vaikom Satyagraha played a crucial role in highlighting the issue of untouchability and paved the way for future anti-caste movements in India.