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Read the excerpt from Citizenship.

Before women were allowed to vote, both men and women organized, protested, and marched. Finally, in 1920, the 19th Amendment to the Constitution gave women the right to vote.

How does this example support the author's main purpose in the book?
A. It shows how citizens' actions affect today's issues.
B. It analyzes how citizenship was different in the past.
C. It explains what an amendment to the Constitution is.
D. It shows that citizens' actions can change society.