The correct answer is D. The federal inspection of meat products resulted of Upton Sinclair's novel The Jungle.
Explanation:
The Jungle is a novel written by American journalist and novelist Upton Sinclair in 1906. His main character is Jurgis Rudkus, a Lithuanian immigrant who moved with his family to Chicago. He and his family live near the meat district, where many immigrants work.
The description of the poor working conditions in the meat industry prompted President Theodore Roosevelt to appoint a commission of inquiry into working conditions in the meat industry and to bring labor and regulatory reforms to food production through the Pure Food and Drug Act of 1906. A chemistry lab was added to the United States Department of Agriculture (USDA) to control the quality of food. In 1930, this laboratory would become the Food and Drug Administration (FDA).
