Which of the Following Observations Concerning Knickerbocker's Theory Is True

Which of the following observations concerning Knickerbocker's theory is true?

A) It does not explain imitative FDI behavior by firms in oligopolistic industries.
B) Economists favor this theory as an explanation for FDI compared to the internalization theory.
C) It addresses the issue of whether FDI is more efficient than exporting or licensing for expanding abroad.
D) It does not explain why the first firm in an oligopoly decides to undertake FDI rather than to export or license.