This question asks you to match a list of biosphere reserves to the states in which they`re located. The correct answer is 4, which correctly pairs each biosphere reserve with its matching state.

Option 1 is incorrect because Similipal is located in Orissa, not Sikkim, and Dehong Deband is in Arunachal Pradesh, not Uttaranchal.

Option 2 is also incorrect. It correctly identifies Similipal as being in Orissa, but then misplaces Dehong Deband in Meghalaya instead of Arunachal Pradesh, Nokrek in Uttaranchal instead of Meghalaya, and Kanchenjunga in Sikkim.

Option 3 is incorrect because it has Similipal in Sikkim, when it should be in Orissa, and Dehong Deband is in Meghalaya, not Arunachal Pradesh.

In contrast, option 4 correctly places Similipal in Orissa, Dehong Deband in Arunachal Pradesh, Nokrek in Meghalaya, and Kanchenjunga in Sikkim.