The Reaction of Nitrogen with Oxygen to Form Nitrogen Monxide $\times$

The reaction of nitrogen with oxygen to form nitrogen monxide can be represented by the following equation.
N₂(g) + O₂(g)
2NO(g)
At 2000°C,the equilibrium constant,K_c ,has a value of 4.10 $\times$ 10^-4.What is the value of K_p?

A) 2.17 $\times$ 10^-8
B) 4.10 $\times$ 10^-4
C) 7.65 $\times$ 10^-2
D) 7.75
E) None of these choices is correct.