The United States Post Office and the Rail Service Amtrak

The United States Post Office and the rail service Amtrak, along with other independent agencies including the Federal Deposit Insurance Corporation (FDIC) , which provides banking deposit insurance, are different from other federal agencies in that they:

A) have tended to have large operating deficits in recent years.
B) are "government corporations," agencies run more like private businesses, performing and charging for market services.
C) have broad powers to provide public services that are, in all cases, too expensive or too socially and economically important to be left to private initiatives.
D) are completely free of presidential control or influence.