I think the answer to that would be B.
He was a white Massachusetts abolitionist & suffragist. He & Isaac Knapp created the newspaper "The Liberator" which aided in the abolition of slavery. He later in life created The American Anti-Slavery Society.
I believe it's "<span>the source of the Mississippi River."
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Special words or expressions that are used by a particular profession and are difficult for others to understand are called "jargon," since they are often only understood by people "in the know".
