Which Choice BEST Represents a Balanced Equation for the Reaction $\rightarrow$

Which choice BEST represents a balanced equation for the reaction of nitrogen gas with hydrogen gas to produce ammonia?

A) N₂ + 3 H₂ $\rightarrow$ 2 NH₃
B) 2 N + 3 H $\rightarrow$ NH₃
C) N₂ + 6 H $\rightarrow$ 2 NH₃
D) N + 3 H $\rightarrow$ NH₃