Answer:
D. However, factory labor is more available than work for many domestics, seamstresses and school-teachers.
Step-by-step explanation:
According to the section "A Factory Girl, Lowell Offering, December 1840." the narrator talks about the female and how getting a steady work was difficult for them. He mentions that the wages of factory girls are higher than those of females engaged in most other occupations.
Therefore, the sentence from the section that BEST supports the idea that steady work was difficult for women to find is "However, factory labor is more available than work for many domestics, seamstresses and school-teachers."