Intended to make people aware of the working conditions experienced by immigrant workers, but his work is most known for exposing the unsanitary conditions common in the meatpacking industry

r.Upton Sinclair

Explanation:

Upton Sinclair was an American journalist, novelist, writer, and the winner of the Pulitzer Prize of Fiction, 1943.

His most notable work is The Jungle, a novel published in 1906. It is a social novel that represents the exploitation of the immigrants in Chicago in the industrial sector.

He describes the lives of poor workers of the meat industry. In this novel, he presents to the readers the harsh conditions of life and work the working immigrants endured, with no social protection.

- a.) african slaves and indentured servant’s

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the answer would be logic.