Progressive women reformers worked to: reduce wages

limit the workday

overturn the nineteenth amendment

establish segregated schools in chicago

Limit the workday, in the late 19th-early 20th century many people worked 12 hour workdays.

I believe the answer is: Limit the workday,

During the Progressive women reformers, the employees are expected to work 12 hours a day or more by the corporations.

This leave the women unable to fulfill the roles as breadwinner and the parents properly since they are also expected by society to take care of the children and the household.