Step 1: Understanding the slogan.
The slogan "One Caste, One Religion, One God" was given by Sri Narayan Guru, a social reformer and spiritual leader in India. This slogan emphasized social equality, the abolition of caste distinctions, and religious unity.
Step 2: Explanation of the options.
- (A) Raja Ram Mohan Roy: Incorrect. While Raja Ram Mohan Roy was a prominent social reformer, he is best known for promoting the abolition of Sati and advocating for modern education.
- (B) Periyar: Incorrect. Periyar E. V. Ramasamy was a social reformer who fought against the caste system and for the rights of lower castes, but he did not coin this specific slogan.
- (C) Mahatma Gandhi: Incorrect. Mahatma Gandhi promoted nonviolence and the unity of all castes but did not use this exact slogan.
- (D) Sri Narayan Guru: Correct. Sri Narayan Guru, a social reformer from Kerala, advocated for social equality and the removal of caste distinctions, and he coined this slogan.
Step 3: Conclusion.
The correct answer is (D) Sri Narayan Guru, as he is known for this slogan that promoted social unity and equality.
Final Answer:} Sri Narayan Guru.