Explanation:

- Option 1: Atmaram Pandurang was a social reformer but not associated with the founding of Satya Shodhak Samaj.

- Option 2: Gopal Hari Deshmukh, known as "Lokhitwadi," was also a social reformer but did not establish the Satya Shodhak Samaj.

- Option 3: M. G. Ranade was a prominent social reformer and a founding member of the Indian National Congress, but he did not found the Satya Shodhak Samaj.

- Option 4: Jyotiba Phule founded the Satya Shodhak Samaj in 1873 to work towards the upliftment of the marginalized and to combat social discrimination in India.