The correct answer is option 3, Ram Mohan Roy. Ram Mohan Roy was a prominent social reformer and intellectual in the early 19th century. He is often referred to as the "Father of the Indian Renaissance" for his efforts towards modernizing Indian society.

In 1815, Ram Mohan Roy founded the Atmiya Sabha, a socio-religious society aiming to promote social and educational reforms. The Atmiya Sabha aimed to unite individuals from different religious backgrounds and promote universal principles of morality and ethics. The society played a key role in advocating for women`s education, the abolition of sati (the practice of widow burning), and the promotion of widow remarriage.

Option 1, Keshab Chandra Sen, was a prominent figure in the Brahmo Samaj reform movement but is not associated with the founding of the Atmiya Sabha. Option 2, Debendranath Tagore, was also a prominent member of the Brahmo Samaj and father of the famous poet Rabindranath Tagore. Option 4, Bijoy Krishna Goswami, does not have any historical significance related to the founding of the Atmiya Sabha.

Therefore, the correct answer is option 3, Ram Mohan Roy.