[单项选择]

Consumers and producers obviously make decisions that mold the economy, but there is a third major element to consider the role of government. Government has a powerful effect on the economy in at least four ways:
Direct Services. The postal system, for example, is a federal system serving the entire nation, as is the large and complex military establishment. Conversely, the construction and maintenance of most highways is the responsibility of the individual states, and the public educational systems, despite a large funding role by the federal government, are primarily paid for by county or city governments. Police and fire protection and sanitation services are also the responsibilities of local government.
Regulation and Control. The government regulates and controls private enterprise in many ways, for the purpose of assuring that business serves the best interests of the people as a whole. Regulation is necessary in areas where private enterprise is granted
A. Postal system.
B. Military establishment.
C. Funding the public educational systems.
D. Police and fire protection service.

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