Which amendment granted women the right to vote?

The 19th Amendment to the United States Constitution, ratified in 1920, explicitly granted women the right to vote, prohibiting any U.S. citizen from being denied the right to vote on the basis of sex. This amendment marked a significant achievement in the women's suffrage movement, which campaigned for years to secure voting rights for women.

The other amendments listed do not relate to women's voting rights. The 15th Amendment prohibits denying the right to vote based on race, while the 21st Amendment repealed Prohibition. The 24th Amendment eliminated poll taxes in federal elections, further expanding voting access but not specifically addressing women's voting rights. Therefore, the 19th Amendment is the correct answer, as it directly recognizes women's suffrage.