A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is (are)

A

$$NH_4NO_3$$

B

$$NH_4NO_2$$

C

$$NH_4Cl$$

D

$$(NH_4)_2SO_4$$