The purpose of government is best described by option B: to maintain law and order in a country. While governments may engage in trade deals with other countries and play a role in economic policies, their primary function is to establish and enforce laws, ensure the safety and security of its citizens, and maintain social order within the country. Option C, ensuring everyone has a job, is more closely related to economic policies and employment, which is a role that governments may have to varying extents depending on the nation. Option D, determining the boundaries between countries, is a function typically associated with international relations and diplomacy, rather than the overarching purpose of government.
