What Is the Correct Equilibrium Constant Expression for the Formation $K=\frac{P_{\mathrm{NH}_{3}}}{P_{\mathrm{N}_{2}} \times P_{\mathrm{H}_{2}}}$

What is the correct equilibrium constant expression for the formation of ammonia gas from nitrogen gas and hydrogen gas?

A) $K=\frac{P_{\mathrm{NH}_{3}}}{P_{\mathrm{N}_{2}} \times P_{\mathrm{H}_{2}}}$
B) $K=\frac{\left(2 P_{\mathrm{NH}_{3}}\right) ^{2}}{P_{\mathrm{N}_{2}} \times\left(3 P_{\mathrm{H}_{2}}\right) ^{3}}$
C) $K=\frac{P_{\mathrm{N}_{2}} \times\left(3 P_{\mathrm{H}_{2}}\right) }{\left(2 P_{\mathrm{NH}_{3}}\right) }$
D) $K=\frac{\left(P_{\mathrm{NH}_{3}}\right) ^{2}}{P_{\mathrm{N}_{2}} \times\left(P_{\mathrm{H}_{2}}\right) ^{3}}$
E) $K=\frac{P_{\mathrm{N}_{2}} \times\left(P_{\mathrm{H}_{2}}\right) ^{3}}{\left(P_{\mathrm{NH}_{3}}\right) ^{2}}$