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"Meat scraps were also found being shoveled into receptacles from dirty floors where they were left to lie until again shoveled into barrels or into machines for chopping. These floors, it must be noted, were in most cases damp and soggy, in dark, ill-ventilated rooms, and the employees in utter ignorance of cleanliness or danger to health, expectorated at will upon them. In a word, we saw meat shoveled from filthy wooden floors, piled on tables rarely washed, pushed from room to room in rotten box carts, in all of which processes it was in the way of gathering dirt, splinters, floor filth, and the expectoration of tuberculosis and other diseased workers."-Source: "The Neill-Reynolds Report," 1906Which of the following developments contributed most directly to the conditions described in the excerpt?

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