For the Nitrogen Fixation Reaction, 3H₂(g) + N₂(g) 2NH₃(g)

For the nitrogen fixation reaction, 3H₂(g) + N₂(g) 2NH₃(g) , K_c = 6.0 × 10^-2 at 500°C. If 0.250 M H₂ and 0.050 M NH₃ are present at equilibrium, what is the equilibrium concentration of N₂?

A) 3.3 M
B) 2.7 M
C) 0.20 M
D) 0.083 M
E) 0.058 M