The evolution of human security can be analyzed in two separate periods, during the Cold War and in the post-Cold War era. The end of the Cold War changed the threat perception in international relations. The threat perception now encompasses non-military threats. Thus, the referent object of security is now not the state, but human beings. One can provide different reasons for this transformation; however, almost all scholars agree that since the end of Cold War, the state-centered threats lost their relative importance in the international system. The correct option is A.