Assume the supply function for good X can be written as Qs = -100 + 27Px - 5Py - 1.8W, where Px = the price of X, Py = the price of good Y, and W = Wage index for workers in industry X. According to this equation, all else constant, a 5 unit increase in the wage index would cause: A) quantity supplied to increase by 9 units and be shown by a movement up the supply curve. B) quantity supplied to decrease by 9 units and be shown by a movement down the supply curve. C) quantity supplied to increase by 9 units and be shown by a rightward shift of the supply curve D) quantity supplied to decrease by 9 units and be shown by a leftward shift of the supply curve