In which battle were the French defeated decisively during the Third Carnatic War?

The correct option is C The Battle of Wandiwash
The Battle of Wandiwash between the French, under the comte de Lally, and the British, under Sir Eyre Coote. This was the Third Carnatic War fought between the French and the British. It was the decisive battle in the Anglo-French struggle in southern India during the Seven Years’ War (1756–63). The French were then restricted to Pondichéry, where they surrendered on 16 January 1761.