The inference shows that Mary Paul's attitude towards her work at the Lowell mills was C. Mary Paul believes that working in the mill will provide her with the opportunity for an education.
It should be noted that an inference simply means the conclusion that can be deduced based on a story.
In this case, Mary Paul's attitude towards her work at the Lowell mills was that she believes that working in the mill will provide her with the opportunity for an education.
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