Answer:
b. If a company assigns the same cost of capital to all of it's projects regardless of each project's risk, then the company is likely to reject some safe projects that it actually should accept and to accept some risky projects that it should reject.
Explanation:
Every project under consideration has it's own risk and rewards and likewise differ in respect to expected cash flows and associated costs. For example, in case of a lessee deciding to borrow from a bank and buying an asset would use cost of debt as his cost of capital.
Similarly, a lessor who leases assets would evaluate his leasing projects based upon his overall cost of capital owing to the fact, he may have financed those assets from multiple sources such as equity, debt or retained profits.
Thus, to reflect the true viability of undertaking a project, an appropriate cost of capital is to be applied. Since if a common cost of capital is applied to all projects, that would lead to inaccurate results and could result into bad decision making.