Explanation:

The **Second Anglo-Mysore War** (1780-1784) was a conflict between the Kingdom of Mysore, led by Hyder Ali and later Tipu Sultan, and the British East India Company. The war concluded with the signing of the **Treaty of Mangalore** on March 11, 1784. This treaty was significant as it restored the pre-war status quo, with both sides agreeing to return conquered territories and prisoners of war. Option B is correct. Option A, the Treaty of Salbai (1782), ended the First Anglo-Maratha War, establishing peace between the British and the Marathas. Option C, the Treaty of Purandar (1776), was signed between the British East India Company and the Maratha Peshwa, though it was later repudiated and did not end a major Anglo-Mysore War. Option D, 'Mysore', is not a treaty but the name of the kingdom involved; while treaties were signed *at* Mysore in other contexts, the specific treaty ending the Second Anglo-Mysore War was named after Mangalore.