The ______ Amendment made clear that no state may deny the right to vote on the basis of sex.

• A. Fifteenth
• B. Twentieth
• C. Twenty-first
• D. Nineteenth

Answer: (D)

The main idea is protecting voting rights from sex-based discrimination. The Nineteenth Amendment forbids denying or abridging the right to vote because of sex, guaranteeing women the right to vote nationwide. It was ratified in 1920 after decades of advocacy and protest, marking the legal culmination of the women's suffrage movement.

The other amendments address different issues, so they don’t fit this question as the basis for sex-based voting protections: the Fifteenth Amendment prohibits denying the vote on account of race, color, or previous condition of servitude; the Twentieth Amendment concerns the terms of elected offices; the Twenty-first Amendment repeals Prohibition.