Good X and good Y both use a common input Z for production. Assume downward-sloping demand curves and upward-sloping supply curves for all these goods and input. Suppose now we have Py = 17 and Qy = 20. Given a decrease in demand in the market of X, other things being equal, which of the following price and quantity pairs (Py, Qy) can be true under the new equilibrium in the market of good Y? A) (15,20) B) (15,18) C) (19,18). D) (15,22) E) None of the above