Final answer:
President Roosevelt gained a reputation as a progressive by supporting the Pure Food and Drug Act.
Step-by-step explanation:
The correct answer is B. Supporting the Pure Food and Drug Act. The Pure Food and Drug Act was a significant piece of legislation passed during President Roosevelt's administration. This act aimed to ensure that food and drugs sold in the United States were safe and properly labeled, protecting consumers from harmful products and deceptive practices. By supporting this act, President Roosevelt demonstrated his progressive stance on consumer protection and public health.