Which of the following was a reform law passed during Theodore Roosevelt's presidency?

The Underwood-Simmons Tariff Act was enacted in 1913, after Roosevelt's presidency, and focused on reducing tariffs and implementing a federal income tax. Although it was a significant reform in its own right, it does not belong to Roosevelt’s legislative accomplishments.

The Federal Reserve Act was passed in 1913, establishing the Federal Reserve System as the central banking authority in the United States. While it was an important reform for the banking system, it occurred after Roosevelt's time in office.

The Payne-Aldrich Tariff Act was passed in 1909 during Roosevelt's presidency but was considered a compromise that did not significantly lower tariffs as intended. Instead, it faced criticism and is often viewed as a setback to Roosevelt's progressive agenda.

The Sherman Antitrust Act was originally passed in 1890, well before Roosevelt's presidency. Although Roosevelt vigorously enforced this law to combat monopolies, it was not a reform law that he enacted.