Realism, neoliberalism, or constructivism

Which of these three theories (realism, neoliberalism, or constructivism) best accounts for the constants and trends of the international system? If each of them can account for at least some features of the system, then explain how. Advice: Pay close attention to behavioral assumptions behind the theories before seeking to apply them to features of the international system. Part II: Based on your understanding of IR theory, comment on whether or to what degree a particular theory is compatible with a CWV (Christian World View).