Therefore, (a)-(iii); (b)-(iv); (c)-(ii); (d)-(i).

i) Nagaland/Mizoram - Secessionist demands on account of tribal identity. Both are the north eastern states with tribal majority.

ii) Jharkhand/Chattisgarh- Before separation Jharkhand was part of Bihar and Chattisgarh of Madhya Pradesh respectively, but there were regional dispute due to different ethnicity which lead to secession.

iii) Punjab- The northern state had completely different ethnicity, culture and religion from the rest part of India.

iv) Tamil Nadu- The southern state has its own linguistic identity which spark tensions with the centre.