For Which of the Following Reactions Is K_p = K_c $\rightleftharpoons$

For which of the following reactions is K_p = K_c?

A) 2 CO₂(g) $\rightleftharpoons$ 2 CO(g) + O₂(g)
B) CH₄(g) + 2 O₂(g) $\rightleftharpoons$ CO₂(g) + 2 H₂O(g)
C) C(s) + H₂O(g) $\rightleftharpoons$ H₂(g) + CO(g)
D) NH₃(g) $\rightleftharpoons$ 3/2 H₂(g) + 1/2 N₂(g)
E) 2 O₃(g) $\rightleftharpoons$ 3 O₂(g)