The correct answer is: a) Cooch Behar.
Cooch Behar was a princely state in northeastern India, bordering Sikkim to the east. It was founded in the 16th century by the Koch dynasty, and became a British protectorate in 1833. In 1949, it merged with India.
Tripura was a princely state in northeastern India, bordering Bangladesh to the south. It was founded in the 14th century by the Tripura dynasty, and became a British protectorate in 1761. In 1949, it merged with India.
Manipur was a princely state in northeastern India, bordering Myanmar to the north. It was founded in the 7th century by the Ningthouja dynasty, and became a British protectorate in 1891. In 1949, it merged with India.
Kashmir was a princely state in northwestern India, bordering Pakistan to the west. It was founded in the 14th century by the Shah Mir dynasty, and became a British protectorate in 1846. In 1947, it was partitioned between India and Pakistan, with the majority of the state going to Pakistan. The remaining portion of the state, known as Jammu and Kashmir, is a disputed territory between India and Pakistan.