Final answer:
Labor unions in the late 1800s indeed brought attention to poor working conditions but had limited success in enacting fundamental changes such as ending racism, child labor, and advancing women into management positions. Option B is correct.
Step-by-step explanation:
While labor unions in the late 1800s made the public aware of the increasingly dangerous working conditions in factories, the primary impacts of these organizations were to solicit better working conditions and rights for workers. They opened membership to a wide demographic, including women and people of varied racial backgrounds, although they did not end racism or management opportunities for women.
Despite their efforts, there was still a significant amount of progress to be made, particularly in areas such as child labor, which was not effectively addressed until later legislation in the 20th century. With the majority of laborers still unrepresented by unions by the end of the 19th century, the power dynamic heavily favored factory owners.