Answer:
B. As a 24 year-old editor and writer of regional newspapers, he argued for the freedom of the press, fair treatment of labor, and against government oppression. (Paragraph 7)
This quotation best supports the answer to Part A because it provides evidence that Karl Marx was an influential thinker who advocated for social change. The quotation highlights his advocacy for freedom of the press, fair treatment of labor, and against government oppression, which shows that he was an important figure in the fight for social justice.