Answer:
b. a rational firm will not take out a loan for the investment.
Step-by-step explanation:
For a company to continue to exist to perpetuity, the company must stay profitable.
A key consideration in the investment of funds into capital expenditure or other forms of investments is the rate of return. When this is compared with the cost of capital required to fund the investments (by debt or equity or by both debt and equity), it is only rational that the the rate of return be higher than the cost of capital.
The cost of capital in this case is the interest rate on the loan (a form of debt financing).