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This question has to do with simply writing down the oxidation state of nitrogen first in the reactant compound and then the product compound. After that, you just have to compare the oxidation state changes. Working out the oxidation state is taught during O'level Chemistry. Here are the changes:
A: -3 -----> + 2 ( a change of 2-(-3) = 5)
B: +4 -----> +5 (a change of 1)
C: +2 -----> +4 (a change of 2)
D: -3 -----> 0 ( a change of 3) and +2 -----> 0 (a change of -2).
The greatest change occurs in A. Thus, 'A' is correct.