Stein, in terms of broader meaning, defined the concept as comprising all international relations and all international interactions for a certain topic. For example, international monetary regime is just seen as international relations relating to money. “At one extreme, regimes are defined so broadly as to constitute either all international relations or all international interactions within a given issue area. In this sense, an international monetary regime is nothing more than all international relations involving Money.” Therefore, regime, at least for simple meaning, refers to rules of game (game of international politics). In broader meaning, it comprises all international institutions and regulations and formal aspect of all state behaviors. The correct answer is B.