MM Proposition I with taxes supports the theory that:
A.
the value of an unlevered firm is equal to the value of a levered firm plus the value of the interest tax shield.
B.
the value of a firm is inversely related to the amount of leverage used by the firm.
C.
there is a positive linear relationship between the amount of debt in a levered firm and its value.
D.
a firm's cost of capital is the same regardless of the mix of debt and equity used by the firm.
E.
a firm's weighted average cost of capital increases as the debt-equity ratio of the firm rises.