$A$ metal $M$ reacts with $N_2$ to give a compound '$A$' $(M_3N)$. '$A$' on heating at high temperature gives back '$M$' and '$A$' on reacting with $H_2O$ gives a gas '$B$'. '$B$' turns $CuSO_4$ solution blue on passing through it. $A$ and $B$ can be

  • A
    $Al$ and $NH_3$
  • B
    $Li$ and $NH_3$
  • C
    $Na$ and $NH_3$
  • D
    $Mg$ and $NH_3$

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