Which aspect of upton sinclair’s life best explains his reasons for writing the jungle?

His socialist politics, is the right answer.

Explanation:

The Socialist Politics Upton Sinclair prompted him to compose a Novel known as “The Jungle” in the year 1906. This novel impersonates the severe conditions and exploited stories of the immigrants, particularly in the Meatpacking business of the U.S. His main objective for writing this novel was his Promotion of Socialism. As a result of his novel, the government had to pass some inspection laws.

they sometimes resort to unethical tactics.

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.