Final answer:
Upton Sinclair's investigative journalism in ‘The Jungle’ led to significant reforms in the meatpacking industry with the passage of the Meat Inspection Act and the Pure Food and Drug Act in 1906.
Step-by-step explanation:
Among the options provided, the development of the food processing industry, specifically meat packing, was significantly influenced by Upton Sinclair’s work, although he was not responsible for founding the industry itself. Upton Sinclair, through his investigative journalism and novel The Jungle, exposed the unsanitary conditions of the meatpacking industry, which led to public outrage and the passage of the Federal Meat Inspection Act and the Pure Food and Drug Act in 1906. These reforms included federal inspection of meat processing and stringent cleanliness requirements for meatpackers. It’s important to note that Sinclair's intention was to shed light on the exploitation of workers and promote socialism, but the actual result was substantial food regulation reform.