Which amendment gives women the right to vote?

The Nineteenth Amendment is the correct answer because it explicitly grants women the right to vote. Ratified in 1920, this amendment removed any legal barriers at the federal or state level that prohibited women from participating in elections. The Nineteenth Amendment was a significant milestone in the women's suffrage movement, which sought to establish equal voting rights for women in the United States.

Understanding this, the other amendments listed do not pertain to women's voting rights. The Fifteenth Amendment addresses voting rights for men regardless of race, but it does not include gender. The Twenty-fourth Amendment prohibits poll taxes in federal elections, ensuring that economic barriers do not prevent people from voting, but again, it does not specifically address women's rights. The Twenty-first Amendment repealed Prohibition and has no connection to voting rights at all. Thus, the Nineteenth Amendment stands out as the definitive legal protection for women's suffrage in the U.S.