1. Upton Sinclair's The Jungle was originated from a cover story of the meat-workers strike of 1904, Chicago. The main purpose was to expose the exploitation of the workers by the Beef Trust, but it also showed the horrific meatpacking practices that produced the food. So the Meat Inspection Act of 1906 was passed, by which all of the animals must have been inspected before and after the slaughter by Government officials.
2. C. Limiting the number of immigrants entering the U.S. was not a concern of the progressive movement.