At a Certain Temperature, for the Reaction NH ₄Cl (S)

At a certain temperature, for the reaction NH ₄Cl (s) NH₃(g) + HCl (g) , K p = 9.0.
What is the equilibrium partial pressure of NH₃?

A) 9.0 atm
B) 0.11 atm
C) 3.0 atm
D) 0.33 atm
E) 0.91 atm