The seven sister states are a group of seven states in northeastern India. The correct answer is option 1, which includes the states Tripura, Meghalaya, Assam, Arunachal Pradesh, Nagaland, Manipur, and Mizoram.
Option 2 is incorrect because it includes the state of Sikkim and West Bengal, which are not part of the seven sister states.
Option 3 is also incorrect because it includes the state of Sikkim and West Bengal, which are not part of the seven sister states. It also includes the state of Tripura, which is not part of the seven sister states.
Option 4 is incorrect because it includes the state of Orissa, which is not part of the seven sister states. It also includes the state of Sikkim, which is not part of the seven sister states.
Alert - correct answer should be option 1