Final answer:
The Sherman Antitrust Act enacted by President Roosevelt aimed to break up monopolies and big corporations, promoting fair competition in the market.
Step-by-step explanation:
The correct answer is b. Sherman Antitrust Act.
The Sherman Antitrust Act was enacted by President Theodore Roosevelt in 1890 to break up monopolies and big corporations, and to promote fair competition in the market. It was designed to prevent companies from engaging in anti-competitive practices such as price-fixing, trust formation, and monopolization of industries.
For example, the act was used to break up Standard Oil, a powerful monopoly controlled by John D. Rockefeller, into smaller, more competitive companies. The act has been instrumental in regulating and challenging monopolistic practices in the United States.
Learn more about The Sherman Antitrust Act