In the Twenty-First Century, What Accurately Describes the Methods Used

In the twenty-first century, what accurately describes the methods used by scholars of international relations?

A) Scholars focus only on a combination of the historical and philosophical approaches.
B) Since the end of communism in the Soviet Union, scholars no longer have any use for radical theory.
C) Scholars agree that the behavioral approach will be the key method used in the future of international relations.
D) All scholars agree the postmodern approach is most useful.
E) Scholars use a mixed-methods approach.