Final answer:
Nellie Bly did not go undercover to investigate a meat packing plant; it was Upton Sinclair who exposed the meatpacking industry in his novel 'The Jungle', leading to significant reforms.
Step-by-step explanation:
The statement that Nellie Bly was the first reporter to go undercover to investigate conditions in a meat packing plant is False. The actual reporter who gained fame for investigating and exposing the meatpacking industry through his novel The Jungle was Upton Sinclair, not Nellie Bly. Nellie Bly was known for her investigative work in which she feigned insanity to uncover the poor conditions in a New York asylum, as detailed in her report Ten Days in a Mad-House. The conditions in the meatpacking industry were later exposed by Upton Sinclair, whose work led to the Meat Inspection Act and the Pure Food and Drug Act of 1906.