MM Proposition I with Taxes Supports the Theory That

MM Proposition I with taxes supports the theory that:

A) there is a positive linear relationship between the amount of debt in a levered firm and its value.
B) the value of a firm is inversely related to the amount of leverage used by the firm.
C) the value of an unlevered firm is equal to the value of a levered firm plus the value of the interest tax shield.
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.