The Decomposition of Ammonia Is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g)

The decomposition of ammonia is: 2 NH₃(g) ⇌ N₂(g) + 3 H₂(g) .If the partial pressure of ammonia is 1.6 × 10^-3 atm and the partial pressures of N₂ and H₂ are each 0.25 atm at equilibrium,what is the value for K_c at 400°C for the forward reaction?

A) 0) 50
B) 1) 4
C) 1) 5 × 10³
D) 4) 6 × 10⁶