The correct answer is option 1, Battle of Plassey. In this battle, Siraj ud-Daulah, the last independent Nawab of Bengal, was defeated by Lord Clive of the British East India Company on June 23, 1757. The Battle of Plassey was a significant moment in Indian history as it marked the beginning of British colonial rule in India.

Option 2, Battle of Buxer, is not the correct answer. The Battle of Buxer took place in 1764, more than 7 years after Siraj ud-Daulah`s defeat at Plassey, and it involved the British forces under Hector Munro and the combined forces of Shah Alam II and Shuja-ud-Daulah.

Option 3, Battle of Panipat, is also not the correct answer. The Battle of Panipat refers to three different battles that took place in the 16th and 18th centuries, none of which involved Siraj ud-Daulah or Lord Clive.

Option 4, Battle of Haldighati, is also incorrect. The Battle of Haldighati was fought in 1576 between the forces of Mughal Emperor Akbar and the Rajput ruler Mahar