Keohane adopts the significant role of hegemony for establishing and creating the international regimes. Howver, Keohane opposed the argument that international regimes and cooperation would not be created or continued in post hegemonic era. Keohane, in his study, argues that cooperation would be possible even in the lack of a hegemonic power in case there are international regimes that assist to establish cooperation. In other words, “regimes are examples of cooperative behavior, and facilitate cooperation, but cooperation can take place in the absence of established regimes.

While realists insist that a hegemonic power is necessary for enforcing states to cooperate and that this cooperation may not continue in post hegemonic era, liberals focus that this cooperation would be persisting even after hegemony ended through institutions. This is why cooperation, according to Keohane, should be thought with institutions in the post hegemonic era. The correct answer is A.