The “other half” that Jacob Riis referred to in his 1890 book, How the Other Half Lives, were the captains of industry. upper class. working poor. growing middle class.

C. The working poor

Explanation:

Jacob Riis was a muckraker that exposed the conditions that many immigrants lived in. Most immigrants, since they were different, were not given the same opportunities as others, and were therefore poor/moved to cities for jobs.

I hope this helped!

i just did something on this guy a few days a go give me two minutes to find it in my notes.

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.