The correct answer is option 3, Ishwar Chandra Vidyasagar. In the year 1856, Ishwar Chandra Vidyasagar played a significant role in removing the legal obstacles to the remarriage of widows through law. He was a prominent social reformer and scholar who campaigned for various socio-cultural reforms in 19th century Bengal.
Ishwar Chandra Vidyasagar was particularly concerned about the issues faced by widows in Indian society. He advocated for widow remarriage as a means to address their plight. His efforts led to the passing of the Widow Remarriage Act in 1856, which allowed widows to remarry legally.
The act was a significant step towards improving the status and rights of widows in Indian society. By removing the legal barriers to their remarriage, Vidyasagar`s efforts aimed to provide widows with the opportunity to lead a fulfilling life even after the death of their husbands.
Therefore, it was through the efforts of Ishwar Chandra Vidyasagar that the legal obstacles to the remarriage of widows were removed through law in 1856.