I need a more detailed explanation to help you.
Edited passage (corrections are in bold, everything else is fine):
Considered one of the most significant documents in the history of the democracy, the Magna Carta was written by thirteenth-century barons to protect their rights against King John of England. During the American Revolution, the document inspired the colonists in their pursuit of freedom.
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The correct answer here is A.
The word "gross" in this line from Frederick Douglas's famous speech named
<span>“What to the Slave Is the Fourth of July?” </span>means flagrant or extreme. This term is often used with the word "injustice" and it means unacceptable and obvious which is definition for flagrant as well.