What legislation was directly influenced by Upton Sinclair's novel "The Jungle"?

Upton Sinclair's novel "The Jungle," published in 1906, highlighted the appalling conditions in the meatpacking industry, particularly in Chicago. The graphic depictions of unsanitary practices, poor working conditions, and the treatment of workers in the industry prompted public outrage and concern. This outcry was instrumental in influencing the passage of the Meat Inspection Act in the same year.

The Meat Inspection Act established federal regulations concerning the sanitary processing of meat and mandated that all meat products be inspected for quality and safety. It aimed to ensure that the meat consumed by Americans was produced under safe and sanitary conditions, directly addressing the issues Sinclair raised in his book. Thus, the correct answer focuses on the legislative outcome that was a direct response to the revelations brought forth by Sinclair's work, which vividly depicted the need for reform in the meat industry.