Answer (C) is correct. The theory underlying the cost of capital is based primarily on the cost of long-term funds and the acquisition of new funds. The reason is that long-term funds are used to finance long-term investments. For an investment alternative to be viable, the return on the investment must be greater than the cost of the funds used. The objective in short-term borrowing is different. Short-term loans are used to meet working capital needs and not to finance long-term investments.