Answer:
B . combining spoiled meat with other meat and then selling .
Step-by-step explanation:
Upton Sinclair's The Jungle spoke at great lengths about how the disgusting practice of mixing spoiled meat and other meat to hide their rotten smell was rampant in the Chicago meat industry.
The public outrage by this discovery forced the United States Drug and Food agency to radically improve the quality of meat and regulations of American slaughterhouses.