Which of the Following Statements About "Real Options" Is True

Which of the following statements about "real options" is true?

A) The longer-term the project, the less important they are to consider.
B) Real options affect only expected cash flows, not the cost of capital associated with a project.
C) The shorter-term the project, the more important they are to consider.
D) The longer-term the project, the harder they are to value.