What resulted from the public outcry related to the jungle? increased conservation efforts backlash against labor unions regulation of food quality rejection of political machines?

The correct option is C
Regulation of food quality

 The novel by Upton Sinclair, named the Jungle, presented an expose of the meat packaging industry and became a best seller, ans was translated into 17 different languages.This public outcry led to the 1906 Meat Inspection Act and the Pure Food and Drug Act. It also, however, led to a report issued the same year by the Department of Agriculture's Bureau of Animal Husbandry that refuted the worst of Sinclair's allegations.

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