Your going to have to strike put the answers you know are wrong. Textile mills are used to make cotton faster to drain it and to get all the seeds out of the cotton before they ship them off they did not hire children since how they are too young to run a machine. (option A) The hired women because men are usually the ones doing hard labor and getting the cotton. (option D) When it came between option B and C I got a little unsure but foreigners are from different country's so they wouldn't be in America. Therefore it came down to option B because they hired young native women in order to do there labor. They get paid small wages and harsh conditions which some became a argument in a few states then came a protest. So the answer is option B "young, native-born women."
Hope this helps!