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

For which of the following reactions is K_c = K_p?

A) N₂(g) + 3 H₂(g) $\rightleftharpoons$ 2 NH₃(g)
B) CO(g) + H₂O(g) $\rightleftharpoons$ CO₂(g) + H₂(g)
C) CO(g) + 3 H₂(g) $\rightleftharpoons$ CH₄(g) + H₂O(g)
D) CaO(s) + CO₂(g) $\rightleftharpoons$ CaCO₃(s)
E) HBr(g) $\rightleftharpoons$ ½ H₂(g) + ½ Br₂( $\ell$ )