The correct option is C Treaty of Aix-La-Chapelle
The First Carnatic War ended with signing of the Treaty of Aix-la-Chapelle in 1748, according to which the French had to return Madras in exchange for the French fortress of Louisbourg in North America, which the British had captured. This war was a reflection of the Anglo-French conflict in Europe as a result of the War of Austrian Succession.