Ammonia can be obtained by
(A) heating of \(NH_{4}NO_{3}\) and \(NH_{4}NO_{2}\)
(B) heating of \(NH_{4}\)Cl and \((NH_{4})_{2}CO_{3}\)
(C) heating of \(NaNO_{3}\) and \(NaNO_{2}\) with zinc in alkaline medium
(D) Reaction of AIN or \(Mg_{3}N_{2}\) or \(CaCN_{2}\) with water.