Which of the following events led to the creation of 'Santhal Pargana'?

Santhal Revolt (1855-56)

The correct answer is Option 4 - Santhal Revolt (1855-56)

It was after the Santhal Revolt (1855-56) that the Santhal Pargana was created, carving out 5,500 square miles from the districts of Bhagalpur and Birbhum. The colonial state hoped that by creating a new territory for the Santhals and imposing some special laws within it, the Santhals could be conciliated.