Answer: c. Sherman Act
Step-by-step explanation:
Officially known as The Sherman Antitrust Act of 1890, the Sherman act was named after it's principal author, Sen. John Sherman.
It was made to regulate competition amongst businesses and prohibits anti-competitive agreements and unilateral conduct attempting to monopolize a market.
The relevant passage in the question was taken from Section 2 of the Shaman Act which deals with end results of commiting acts in violation of the act.