Final answer:
Labor unions and reformers were successful in improving various aspects of working conditions, such as ending child labor and implementing worker's compensation laws, but higher wages were more challenging to achieve.
Step-by-step explanation:
From the options given, higher wages is NOT a success that labor unions and reformers had in improving working conditions. While labor unions and reformers were successful in achieving many improvements in working conditions, such as ending child labor, restricting women's working hours, and implementing worker's compensation laws, improving wages was often a more challenging goal.
Learn more about Successes of labor unions and reformers in improving working conditions