Question

progressive reforms that sought to break up monopolies and limit their power were known as
free enterprise.
trust-busting.
unionism.
restrictive legislation.

Explanation:

• "Free enterprise" refers to an economic system with minimal government intervention, not related to breaking monopolies.
• "Trust - busting" specifically refers to Progressive Era reforms aimed at breaking up monopolistic trusts (large business combinations) to limit their power, which matches the description in the question.
• "Unionism" is about labor unions and workers' rights, not about monopolies.
• "Restrictive legislation" is a broad term, and trust - busting is a more specific and accurate term for the described reforms.

Answer:

B. trust - busting