The correct answer is (b), Plassey.
The Battle of Plassey was fought on 23 June 1757, near the city of Murshidabad, in Bengal, India. The battle was fought between the British East India Company and the Nawab of Bengal, Siraj ud-Daulah. The British were led by Robert Clive, while the Nawab was led by Mir Jafar. The British won the battle, and this victory marked the beginning of British rule in India.
The Battle of Buxar was fought on 22 October 1764, near the city of Buxar, in Bihar, India. The battle was fought between the British East India Company, the Nawab of Awadh, and the Mughal emperor Shah Alam II. The British were led by Hector Munro, while the Nawab was led by Shuja-ud-Daula, and the Mughal emperor was led by Mir Qasim. The British won the battle, and this victory gave the British control of Bengal, Bihar, and Orissa.
The Battle of Seringapattam was fought on 4 January 1799, near the city of Seringapatam, in Mysore, India. The battle was fought between the British East India Company and the Mysore Sultanate, led by Tipu Sultan. The British were led by Arthur Wellesley, later the Duke of Wellington, while Tipu Sultan led his own forces. The British won the battle, and Tipu Sultan was killed. This victory gave the British control of Mysore.
The Battle of Wandiwash was fought on 22 January 1760, near the town of Wandiwash, in Tamil Nadu, India. The battle was fought between the French East India Company and the British East India Company. The French were led by Thomas Arthur, comte de Lally-Tollendal, while the British were led by Eyre Coote. The British won the battle, and this victory gave the British control of the Carnatic region.
In conclusion, the Battle of Plassey was the most significant battle in the establishment of British supremacy in India. The battle marked the beginning of British rule in India, and it gave the British control of Bengal, Bihar, and Orissa.