Which of the Following Statements Correctly Uses the Concept of Opportunity

Which of the following statements correctly uses the concept of opportunity cost in decision making? I. "Because my secretary's time has already been paid for, my cost of taking on an additional project is lower than it otherwise would be."
II) "Since NASA is running under budget this year, the cost of another space shuttle launch is lower than it otherwise would be."

A) I is true, and II is false.
B) I is false, and II is true.
C) I and II are both true.
D) I and II are both false.