According to Young, regimes are social institutions and structures created to regulate the behaviors of states for a certain phenomenon. Like all other social institutions, they are supposed to influence and regulate the behaviors of states. In a system of sovereign states, one of the basic functions of regimes is to encourage the states for cooperation in a certain subject. The purpose of regimes is to form a frame for facilitating the solution of problems through treaties. Regimes are not only making the cooperation easier in the short run, but also in the long run, providing an environment of cooperation for promoting relations. International regime, in the first stance, is understood to regulate the areas out of sovereign rights of states. However, regimes do not intend to unify all cultural, social and political beliefs of all countries unless these have international negative consequences. The correct answer is A.