The wealth and richness achieved thanks to the steel industry in the late 1800s specially benefit steel magnates and store owners. A good example is Andrew Carnegie, one of the richest Americans that at some point was even richer than Rockefeller. However, tenement residents, option c, and immigrants, option d, did not enjoy this prosperity and were commonly abused in their workplace, or had low salaries, which is why many of them formed Unions to protect their interests and rights.