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The correct answer is A. Radical Republicans.
The Fifteenth Amendment gave people of color the right to vote, so D is definitely incorrect. B is incorrect too because labor union organizers wanted all workers to have the same rights. C is incorrect because by passing this Amendment, it would mean better prospects for women too. This leaves us with A, given that these Republicans were the ones who owned slaves in the first place.
Answer:
to tell the reader about an important historical event.
Explanation:
The main reason for the author including this information in the passage was to tell the reader about an important historical event. The author is explaining that the current event taking place has never before happened in the history of civilization, therefore meaning that this current event is making history and will be remembered in the future as a significant historical event. Thus, carrying with it very high importance which the author felt was essential to include.