[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
The balanced chemical equation for given reaction, where Nitrogen and Hydrogen combines to form Ammonia gas is ~
[tex]\qquad \sf \dashrightarrow \: N_2(g) + 3H_2 (g) \rightarrow 2NH_3 (g)[/tex]
Therefore, the correct choice is C