Which of the following is run by the government at the federal,

Which of the following is run by the government at the federal, state or local levels?
A、Coal industry.
B、Steel industry.
C、Motor industry.
D、Postal service.
【正确答案】：D
【题目解析】：邮电服务由联邦政府、州政府或地方政府三级分别管理。