Read the following text. “We live in a world of international regimes. Some of them deal with monetary issues (for example, the Bretton Woods system and its successors); others govern international trades in commodities (for example, the coffee agreement). Some regimes serve to direct the use of natural resources at the international level (for example, the international arrangements for whaling) or to advance the cause of conservation (for example, the agreement on polar bears). Still other regimes address problems pertaining to the control of armaments at the international level (for example, the nuclear nonproliferation regime) or the management of power in international society (for example, the neutralization agreement for Switzerland). And there are some international regimes that encompass several issues within well defined geographical areas (for example, the Svalbard regime and the Antarctic Treaty System).” Fonte: YOUNG, Oran R. International Cooperation: Building Regimes for Natural Resources and the Environment. New York: Cornell University, p. 11. Which is the topic sentence? a. Some of them deal with monetary issues. b. Still other regimes address problems pertaining to the control of armaments at the international level. c. And there are some international regimes that encompass several issues within well defined geographical areas. d. We live in a world of international regimes. e. Some regimes serve to direct the use of natural resources at the international level or to advance the cause of conservation.