For the Reaction 4 NH₃(g) + 7 O₂(g) 2

For the reaction 4 NH₃(g) + 7 O₂(g) 2 N₂O₄ (g) + 6 H₂ O (g) , the relation between K p and K c is:

A) K _p = K _c
B) K _p = K _c(RT) ^{- 3}
C) K _c = K _p(RT) ^{- 3}
D) K _p = K _c(RT) ^{- 9}
E) none of these