In the Chemical Equation 2 Co(NO₃)₃ + 3 (NH₄)₂S $\rightarrow$ Co₂S₃ + 6 NH₄NO₃ , How Many Nitrogen Atoms Are

In the chemical equation 2 Co(NO₃) ₃ + 3 (NH₄) ₂S $\rightarrow$ Co₂S₃ + 6 NH₄NO₃ , how many nitrogen atoms are on each side of the equation?

A) 2
B) 3
C) 6
D) 12
E) 16