When calculating the NPV, What discount rate should we use? A.A discount rate equal to the investment return that could be earned on nonmarketable securities With similar risk characteristics. B.A discount rate equal to the investment return that could be earned on marketable securities With similar risk characteristics. C. A discount rate equal to the investment return that could be earned on low-risk marketable securities. D. A discount rate equal to the investment return that could be earned on high-risk nonmarketable securities. E. None of the above