The answer to the question above is the first option: regulation of the meatpacking industry. "The Jungle" is actually a novel that was written by Upton Sinclair who happens to be a journalist and a novelist too. This novel was written in order to show how the lives of those immigrants in the United States are being exploited. But what this novel also focused on is the unsanitary practices that were done by American meatpacking industry and how this violates any health regulations during the 20th century. This brought the regulation of Meat Inspection Act.