参考答案：C

解析：[分析] 推断题型。 根据第二段第二句...they, too, were eager to provide a drug benefit under Medicare, but they championed alternative legislation that offered a larger drug subsidy and smaller incentives to health insurers to participate．中的health insurer(健康承保人)指的是medicine makers and retailers。从they, too, were eager to provide a drug benefit可知政府本就对这事很热心，排除A项。根据Congressional Democrats...opposed the bill. thundered...可知是Democrats在反对，排除B项；根据smaller incentives to health insurers to participate可排除D项。