Which of the following changes will make the value of a stock go up, other things being held constant? Select one: a. In general, investors become more risk averse b. The required return decreases c. The required return increases d. The growth rate of dividends decreases In general, which of the following rankings, from highest to lowest cost, is most accurate? Select one: a. cost of new common stock, cost of retained earnings, cost of preferred stock, cost of debt b. cost of new common stock, cost of preferred stock, cost of debt, cost of retained earnings c cost of preferred stock, cost of new common stock, cost of retained earnings, cost of debt d. cost of debt, cost of preferred stock, cost of new common stock, cost of retained earnings