The passage states that, before the twentieth century, which of the following was true of many employers? A. They did not employ women in factories. B. They tended to employ single rather than married women. C. They employed women in only those jobs that were related to women's traditional household work. D. They resisted technological innovations that would radically change women's roles in the family. E. They hired women only when qualified men were not available to fill the open positions.