Who preached the doctrine of One religion, one caste and one God for mankind?

Who preached the doctrine of One religion, one caste and one God for mankind?

Who among the following preached the doctrine of “One religion, one caste and one God for mankind“?
[A] Jyotiba Phule
[B] Vivekananda
[C] Sri Narayan Guru
[D] Dr. B. R. Ambedkar

Sri Narayan Guru

Explanation

Sri Narayana Guru preached the doctrine of ‘One caste, One religion, One God.’ Its worth note that one of his athiest disciples, Sahadaran Ayyapan, changed into ‘no religion, no caste and no God for mankind.
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Last Updated: August 27, 2013