If Corporate Profit Were Defined as the Real Price of Capital

If corporate profit were defined as the real price of capital minus the properly defined cost of capital, then:

A) having a tax on corporate profits would be more favorable to investment than having no tax at all.
B) having a tax on corporate profits would be less favorable to investment than having no tax at all.
C) having a tax on corporate profits would leave investment incentives the same as having no tax at all.
D) whether a corporate profits tax was more or less favorable for investment than no tax at all would depend on the rate of tax.