Which of the Following Statements Is True

Which of the following statements is true?

A) There is an opportunity cost to a borrowing nation and to its lending nation if it pays off its external debt.
B) There is no opportunity cost to a borrowing nation or to its lending nation if it does not pay off its external debt.
C) There is an opportunity cost to a borrowing nation if it pays off its external debt, and to its lending nation if it does not.
D) There is an opportunity cost to a borrowing nation if it does not pay off its external debt, and to its lending nation if it does.