Explanation:

Recently, several tribal outfits in Tripura have joined hands to push their demand for a separate state, Greater Tipraland for indigenous communities in the region.

• Among the political parties that have come together for the cause are TIPRA Motha (Tipraha Indigenous Progressive Regional Alliance) and IPFT (Indigenous People’s Front of Tripura).
• Tripura was a kingdom ruled by the Manikya dynasty from the late 13th century until the signing of the Instrument of Accession with the Indian government in 1949. Hence, option B is correct.
• The joint forum has also pointed out that the indigenous people have not only been reduced to a minority, but have also been dislodged from land reserved for them by the penultimate king of the Manikya dynasty Bir Bikram Kishore Debbarman.

Hence option 3rd is correct.