The correct answer is option 3, Raja Ram Mohan Roy. Raja Ram Mohan Roy was a prominent social and religious reformer in Bengal during the early 19th century. He established the "Atmiya Sabha" which served as a precursor to various socioreligious reforms in Bengal. The Atmiya Sabha aimed to promote rational thinking, eliminate superstitions, and advocate for social and educational reforms. It played a significant role in challenging orthodox practices like Sati and was instrumental in the founding of the Brahmo Samaj, a reformist religious movement. While Vivekananda, Dayanand Saraswati, and Arvind Ghosh were also notable reformers and influential figures in their respective social or religious movements, they were not directly associated with the establishment of the Atmiya Sabha.