US primacy:
AWas predicted by constructivist scholars of international relations
BHas stifled debate about the ends and means of American foreign policy
CWas unaffected by 9/11
DIs a key feature of and challenge in the post-cold war order
Correct answer
D. Is a key feature of and challenge in the post-cold war order
Explanation
The correct answer is Is a key feature of and challenge in the post-cold war order.