The correct answer is option 4, V D Savarkar. In 1904, V D Savarkar organized a secret society of revolutionaries called Abhinav Bharat. This society aimed to fight against British colonial rule and work towards the liberation of India. The Abhinav Bharat was a radical organization that believed in armed revolution as the means to achieve independence.

Option 1, Khudiram Bose, is incorrect. Khudiram Bose was a young revolutionary who was involved in the Muzaffarpur bombing in 1908, but he was not associated with the organization Abhinav Bharat.

Option 2, Shyamji Krishna Verma, is also incorrect. Shyamji Krishna Verma was a prominent Indian nationalist who played a significant role in the Indian independence movement, but he was not associated with Abhinav Bharat.

Option 3, Har Dayal, is incorrect as well. Har Dayal was a revolutionary and a scholar, known for his involvement in the Ghadar Party, another revolutionary organization founded in 1913. He was not associated with Abhinav Bharat.

Therefore, the correct answer is option 4, V D Savarkar.