Question

how did progressives in congress attempt to respond to businesses that seemingly controlled entire industries
formed labor unions passing antitrust legislation adopting free market policies regulating child labor

Explanation:

To answer, we analyze each option:

• "Formed labor unions" is done by workers, not Congress.
• "Passing antitrust legislation" targets monopolistic businesses (controlling entire industries), which Progressives in Congress did (e.g., Sherman Antitrust Act, Clayton Act).
• "Adopting free market policies" would not regulate monopolies, contradicting Progressive goals.
• "Regulating child labor" addresses labor conditions, not industry control.

So the correct action is passing antitrust legislation.

Answer:

B. passing antitrust legislation