Question

in 1908, the supreme court ruled in muller v. oregon that
state laws could not break up all monopolies.
states could not decide the length of a workday.
states could regulate fees charged by railroads.
state laws could limit working hours for women.

Explanation:

The 1908 Muller v. Oregon Supreme Court case upheld an Oregon law that limited women's working hours, ruling that states could impose such regulations to protect women's health. The other options refer to different court cases/topics: breaking up monopolies relates to antitrust cases, railroad fee regulation to cases like Munn v. Illinois, and the ruling rejected the idea states couldn't regulate workday length for women.

Answer:

D. state laws could limit working hours for women.