Concept:Satyashodhak Samaj was a social reform society aimed at fighting caste discrimination and promoting education for lower castes.Explanation:Jyotirao Phule founded the Satyashodhak Samaj in 1873 in Pune.He was a social reformer from Maharashtra who worked against the caste system and untouchability.Along with his wife Savitribai Phule, he also started the first girls' school in India in 1848.The Samaj's goal was to uplift Shudras and Ati-Shudras and awaken self-respect among them.Answer:C. Jyotirao Phule