Explanations:The term "sister states" in the context of India refers to the northeastern states that share cultural, historical, and geographical ties. These states are Assam, Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura. The northeastern region of India is known for its unique cultural heritage, diverse ethnic groups, and shared historical experiences.
Each of these states has its own distinct identity, but they are collectively referred to as sister states due to their commonalities and the historical and cultural bonds that tie them together. The northeastern region is geographically isolated from the rest of India, which has contributed to the development of a shared sense of identity among these states.
Among the options provided, Assam, Nagaland, and Mizoram are all part of the northeastern region and are considered sister states. New Delhi, on the other hand, is the capital territory of India and is not part of the northeastern region. It is a union territory and not a state, and it does not share the same cultural and historical ties with the northeastern states.
Therefore, the correct answer is New Delhi, as it is not one of the sister states. Understanding the geographical and political context of the northeastern region and the specific classification of New Delhi as a union territory is crucial to answering this question correctly.