[单项选择]For health insurance, the United States has taken the road less traveled. The United States is the only rich country without universal health insurance. People in the United States spend the most, rely heavily on the private sector, and obtain care from the world’s most complicated delivery system. While some supporters have expressed satisfaction, if not pride, in these remarkable qualities, others contend that the United States faces unique limitations in reforming health care. In her exceptional book, Parting at the Crossroads, Antonia Maioni compares the formation of the U.S. and Canadian health-care systems for the years 1930—1960. The United States and Canada are often considered the most similar of Western democracies. They share a common border, are wealthy, and have federal government. Their trade unions are only moderately powerful, and their populations are diverse and young. Nevertheless, their health-insurance systems are nearly opposite. The United States relies on a A. the labor union of a country can play a positive role in health-insurance reform. B. universal health insurance is practicable in a federal government. C. a third party is needed to coordinate the efforts of the government and the labor union. D. the electoral system has a direct impact on the insurance plan.