Answer: A. True
Step-by-step explanation:
Until about a 100 years ago, a single large company could completely control some major U.S. industries, like communications, steel, oil and etc.
Passage of the Sherman Antitrust Act in 1890 eventually led to the break up of these major U.S. monopolies e.g AT&T, Standard Oil, American Tobacco, and etc.
Legal decisions therefore supported entrepreneurs participating in the market revolution by striking down monopolies and encouraging competition thereby regulating market prices.
However, a type of limited monopoly still exists worldwide in form of nationalized assets.