The correct answer is: A) Treaty of Mangalore
The Treaty of Mangalore was signed on 17 February 1784 between the British East India Company and the Kingdom of Cochin. The treaty was a result of the First Anglo-Mysore War, in which the British had supported the Kingdom of Cochin against the Mysore Sultanate. The treaty granted the British control over the port of Mangalore and the surrounding area.
The Treaty of Srirangapatnam was signed on 11 April 1792 between the British East India Company and the Mysore Sultanate. The treaty was a result of the Second Anglo-Mysore War, in which the British had defeated the Mysore Sultanate. The treaty granted the British control over much of the Mysore Sultanate’s territory.
The Subsidiary Alliance Treaty was a series of treaties signed between the British East India Company and various Indian states in the 18th and 19th centuries. The treaties required the Indian states to cede territory to the British and to provide the British with military support.
The Treaty of Bassein was signed on 31 December 1739 between the British East India Company and the Maratha Empire. The treaty granted the British control over the city of Bassein and the surrounding area.
The Treaty of Mangalore was the only treaty among the four that brought the kingdom of Cochin under British control.