Concept:Satyashodhak Samaj was founded by social reformer Jyotirao Phule in 1873 to fight caste oppression and uplift the lower castes.
Explanation:Jyotirao Phule was born in a low‑caste Mali family in Pune, Maharashtra.
He strongly opposed Brahmanical domination and the caste system.
In 1873, he established the Satyashodhak Samaj at Pune.
The Samaj aimed to work for the upliftment of oppressed classes, especially Dalits.
It welcomed people of all castes and religions.
Phule compiled his ideas in the book Satya Sodh (1887) and also wrote Gulamgiri (meaning slavery) in 1873.
Other reformers: Haridas Thakur founded the Matua sect in Bengal; B.R. Ambedkar led temple entry movements for Mahar caste; Ghasidas started the Satnami movement among leatherworkers in Central India.
Thus, only Jyotirao Phule founded the Satyashodhak Samaj.
Answer:Option A - Jyotirao Phule