The 1903 Muller v. Oregon decision upheld

A. limited work hours for women.

B. higher wages for women.

C. women's right to birth control.

D. women's right to vote.

The answer to your question is : A. limited work hours for women

Think about it this way:

Can't be D because 1919 was when women had the right to vote

Can't be B because that wouldn't be fair

Can't be C because that just doesn't make sense

The case upheld Oregon state restrictions on the working hours of women. Just as stated in answer A.