Explanation:

- Option 1: Ramakrishna Paramahamsa

- He was a renowned mystic and spiritual leader in India.

- He was not involved in forming the Tattvabodhini Sabha.

- Option 2: Debendranath Tagore

- He was a prominent leader of the Brahmo Samaj.

- He formed the Tattvabodhini Sabha in 1839 to promote religious and social reform.

- Option 3: Swami Dayanand Saraswati

- He founded the Arya Samaj, a Hindu reform movement.

- He was not connected to the Tattvabodhini Sabha.

- Option 4: Keshab Chandra Sen

- He was a leader in the Brahmo Samaj movement after Debendranath Tagore.

- He did not form the Tattvabodhini Sabha.