The correct answer is: a) Establishing it as a British protectorate.
The Treaty of Yandabo was signed on 24 February 1826 between the British East India Company and the Burmese Empire. It ended the First Anglo-Burmese War. The treaty forced the Burmese to cede control of Assam, Manipur, and Rakhine to the British. It also required the Burmese to pay a large indemnity to the British.
The treaty had a significant impact on Manipur. It established Manipur as a British protectorate. This meant that Manipur was no longer an independent kingdom, but was instead under British control. The British appointed a resident to Manipur, who was responsible for overseeing the administration of the state.
The British protectorate over Manipur lasted until 1947, when Manipur became part of the Indian Union.
The other options are incorrect. Option b) is incorrect because the Treaty of Yandabo did not restore Manipuri independence. Option c) is incorrect because the Treaty of Yandabo did not formally cede Manipur to Burma. Option d) is incorrect because the Treaty of Yandabo did not partition Manipur.