15. If the reaction starts with only 1 mole of A and 1 mole of B in a 1.0 L sealed reaction vessel, the equilibrium constant of this reaction is K. Which of the following statements is correct? (A) The expression for K of this reaction is ([C]2[D])([A][B)3). (B) If K = 1, [A] is 0.5 M at equilibrium. (C) If K= 1, [C] is 0.3 M at equilibrium. (D) If [C] = 0.5 M at equilibrium, K = 0.08. (E) If [D] 0.25 M at equilibrium, K = 0.17.