Who coined the slogan, 'one religion, one caste and one God for mankind'?

Correct option is A

 Sri Narayan Guru, a social reformer from Kerala, spread the idea of equality and oneness of humanity, especially among oppressed castes.

• Jotiba Govind Phule:
  While Jotiba Govind Phule was a significant social reformer who fought against caste discrimination, his focus was primarily on challenging the oppressive practices of the upper castes against the lower castes. The slogan "one religion, one caste, one God for mankind" is not typically associated with him.

• B. R. Ambedkar:
  B. R. Ambedkar was a prominent Dalit leader who fought for the rights and equality of Dalits. His activism focused on eradicating caste discrimination and advocating for the upliftment of the Dalit community. While he spoke about social equality, the specific slogan "one religion, one caste, one God for mankind" is more closely linked to Sri Narayan Guru.

E. V. Ramaswami Nicker:E. V. Ramaswami Nicker, also known as Periyar, was a Tamil social reformer who advocated for the rights of the Dravidian people. His movement, the Dravidar Kazhagam, focused on challenging Brahminical supremacy and promoting rationalism. The slogan "one religion, one caste, one God for mankind" is not generally associated with him.