Answer & Explanation:
The US government ensured that individual companies could not control a market and limit consumers' choices by passing the Sherman Act (answer A). The Sherman Antitrust Act, enacted in 1890, was a key legislation aimed at preventing monopolistic practices and promoting fair competition in business. It was intended to curb anti-competitive behavior such as monopolies, cartels, and price-fixing conspiracies. The act empowered the government to take legal action against companies engaged in practices that restricted trade and harmed consumer welfare. By enforcing the Sherman Act, the US government sought to foster a more competitive market environment that would benefit consumers by providing them with a wider range of choices and fair pricing.