Which one of the following statements is correct?

Group of answer choices

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. In practice, most projects rarely have real options. They are theoretically interesting but of little practical importance.

d. Real options are more valuable when there is very little uncertainty about the true values of future sales and costs.

e. None of the above are correct.