What amendment granted women the right to vote?

The 19th Amendment is the correct answer because it specifically prohibits any United States citizen from being denied the right to vote on the basis of sex. Ratified on August 18, 1920, this amendment marked a significant milestone in the women's suffrage movement, granting women the legal right to vote in all federal and state elections. The passage of the 19th Amendment was the culmination of decades of activism by suffragists and reformers who fought for equal voting rights.

The other amendments mentioned do not pertain to women's voting rights. The 17th Amendment deals with the direct election of U.S. Senators, the 20th Amendment addresses the terms of office for the President and Congress, and the 21st Amendment repealed the prohibition of alcohol. Each of these amendments focuses on different aspects of governance and does not relate to women's suffrage.