Which amendment granted women the right to vote?

The 19th Amendment is significant because it was specifically ratified to grant women the right to vote in the United States. Ratified in 1920, this amendment states that the right to vote cannot be denied on the basis of sex. The movement for women's suffrage was a long and hard-fought battle, which culminated in this constitutional change.

In considering the other amendments mentioned: the 17th Amendment deals with the direct election of U.S. Senators, the 21st Amendment repealed Prohibition, and the 24th Amendment eliminated poll taxes in federal elections, none of which pertain to women's voting rights. The 19th Amendment is uniquely focused on expanding the electoral franchise to include women, making it the correct choice for this question.