The correct answer is A) Travancore.
Travancore was a princely state in India that existed from the 13th century to 1949. It was located in the present-day state of Kerala. The rulers of Travancore were known as the Maharajas.
Travancore was an important ally of the British East India Company. The Maharajas of Travancore actively aided the British in suppressing revolts, such as the Vellore Mutiny of 1806 and the Indian Rebellion of 1857.
The British were grateful for the support of the Maharajas of Travancore. In return, they gave Travancore a great deal of autonomy. Travancore was allowed to maintain its own army and navy, and it was not subject to British taxation.
The relationship between Travancore and the British was mutually beneficial. Travancore was able to maintain its independence and autonomy, while the British were able to secure a loyal ally in India.
The other options are incorrect because they are not princely states that actively aided the British in suppressing revolts.
B) Cochin was a princely state in India that existed from the 11th century to 1949. It was located in the present-day state of Kerala. The rulers of Cochin were known as the Maharajas.
C) Kolathunadu was a princely state in India that existed from the 12th century to 1949. It was located in the present-day state of Kerala. The rulers of Kolathunadu were known as the Kolathiri Rajas.
D) Kozhikode was a princely state in India that existed from the 11th century to 1949. It was located in the present-day state of Kerala. The rulers of Kozhikode were known as the Zamorins.