I believe the answer is: A. The Pure Food and Drug Act
The pure food and Drug Act was created in order to prevent businesses from selling foods and medicines that contain dangerous substances for the consumers. This act was signed by President Theodore Roosevelt in 1906 in order to increase consumer protection in the market.
D. Potential employment is the factor that pulled immigrants to the United States. In their mother countries, they couldn't find any job, which is why they moved to the US in order to make a living.
