In the excerpt from Upton Sinclair's "The Jungle," how does the phrase “they use everything of the pig except the squeal” (Paragraph 1) contribute to the central ideas of the text? Question 4 options:

The phrase refers to the meatpacking industry’s use of the entire animal, even non-meat parts, thus contributing to the central idea of American ingenuity.

The phrase refers to the meatpacking industry’s use of animals, even spoiled meat and non-meat parts, thus contributing to the central idea of the industry’s corrupt and unsanitary nature.

The phrase refers to the meatpacking industry’s terrible treatment of its livestock, thus contributing to the central idea of the industry’s corrupt and cruel animal-raising practices.

The phrase refers to the meatpacking industry’s mistreatment of its employees, taking advantage of them and leaving their only voice, thus contributing to the central idea of the employees exposing the horrors of the industry.