$A$ metal $M$ reacts with nitrogen gas to afford $M_3N$. $M_3N$ on heating at high temperature gives back $M$ and on reaction with water produces a gas $B$. Gas $B$ reacts with aqueous solution of $CuSO_4$ to form a deep blue compound. $M$ and $B$ respectively are

  • A
    $Li$ and $NH_3$
  • B
    $Ba$ and $N_2$
  • C
    $Na$ and $NH_3$
  • D
    $Al$ and $N_2$

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