Consider one of the two equations that can be used to calculate a firm's cost of equity: rE=Div1/P0+g. If the expected growth rate of American Airlines common stock dividends increases and if the price of AAL's stock also increases, what happens to AAL's cost of equity? It_______.
A: increases
B: decreases
C: remains unaffected
D: might go up or down, depending on the relative sizes of the two changes.