Final answer:
The idea that the 'mill girls' have freely chosen factory work is questioned due to lack of alternatives, economic necessity, social pressure, and limited opportunities.
Step-by-step explanation:
The idea that the 'mill girls' have freely chosen factory work is questioned due to a variety of factors. One reason is the lack of alternatives for women at that time, as domestic service was their most common alternative and it offered little freedom or financial stability. Additionally, economic necessity played a role, as factory work provided an opportunity for women to earn money for themselves. Social pressure and limited opportunities also influenced their decision, as there were societal expectations and limited job options for women back then.