Which One of the Following Statements Is Most CORRECT

Which one of the following statements is most CORRECT?

A) Real options change the size, but not the risk, of projects' expected NPVs.
B) Real options change the risk, but not the size, of projects' expected NPVs.
C) Real options can reduce the cost of capital that should be used to discount a project's expected cash flows.
D) few projects actually have real options. They are theoretically interesting but of little practical importance.
E) Real options are more valuable when there is little uncertainty about the true values of future sales and costs.