The french motto of equality supports sociology by reminding people that
they
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a. should follow the rules of the government.
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b. are free to study what causes problems.
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c. need to find comfort in their religious beliefs,
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d. are all brothers regardless of where they were born.
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i wish you all a merry christmas!  

and or happy hanukkah

and a happy new year

the purpose of the heading in the passage is to identify who is telling the story.

this excerpt is part of the book sugar changed the world (2010) written by marc aronson and marina budhos. as the book has been written by two people, the heading "marc" indicates that this specific excerpt is being narrated by aronson. in the fragment, marc describes his grandfather's story after hearing it from his cousin. however, there are other excerpts where budhos is the one that tells the story of her family.

aronson and budhos, who are husband and wife in real life, decided to write sugar changed the world when they found out how sugar, which had an important role in slavery and economy, changed their ancestors' lives.