Please explain the solution in detail.

Q5.  An orange solid (X) on heating, gives a colourless gas (Y) and a only green residue (Z). Gas (Y) on treatment         Mg,  produces a white solid substance.....

      (A)  Mg3N2                (B)  MgO              (C)  Mg2O3              (D)  MgCl2

Kindly refer to the following links:
https://www.meritnation.com/ask-answer/question/why-does-nitric-acid-change-its-colour-from-colorless-to/chemistry/3335986  

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