The answer is D. With more people in the country. More women needed jobs as they would often have just come to the U.S without someone to marry and would need to go work a job.
The effect of increased migration to cities during the early 20th century was due to an increase in women working outside of the home.
The 20th century experienced modernization and urbanization due to the rapid increase in industrial activities. It reduces the class effect and called out for all talented people for employment irrespective of their race, caste, age, and gender.
Therefore, many people migrated from rural areas to cities as well as many women came out to work for supporting their families.
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