The correct answer to the question is option 4, Raja Rammohan Roy. Raja Rammohan Roy was known for his opposition to the Jury Act of 1827. The act was opposed by many Indians because it denied both Hindus and Mohammedans the honor of a seat on the Grand Jury. Raja Rammohan Roy, a prominent social reformer and advocate of religious and social equality, protested against this discriminatory provision of the act.

Option 1, Gopal Krishna Gokhale, is not the correct answer as he was a prominent Indian nationalist and social reformer active in the late 19th and early 20th centuries, much later than the time when the Jury Act was introduced.

Option 2, Lord Sinha, is not the correct answer either. There is no significant historical record of Lord Sinha opposing the Jury Act.

Option 3, Sir Syed Ahmed Khan, is also not the correct answer. While he was a prominent Muslim reformer and educationist during the 19th century, he is not specifically known for opposing the Jury Act.

Therefore, the correct answer is option 4, Raja Rammohan Roy, who was known for his opposition to the Jury Act of 1827 due to its