Trenton Publishing follows a strict residual dividend policy. All else equal (held constant), which of the following factors would be most likely to lead to a decrease in the firm's cash dividend per share? a. The firm's net profit margin increases b. Proportion of equity financing is expected to decrease c. Earnings are unchanged, but the firm issues more new shares of debts (bonds). d. The number of profitable potential projects increases e. The government reduces the individuals' income tax rate from cash dividends income. The remainder of the tax code is not changed