Final answer:
The Nineteenth Amendment, ratified in 1920, guarantees the right to vote regardless of sex, marking a pivotal expansion of democracy and women's suffrage. The correct answer is option c: 19th Amendment.
Step-by-step explanation:
In 1920, the Nineteenth Amendment made clear that no state may deny the right to vote on the basis of sex. This amendment was a culmination of the women's suffrage movement's long campaign for voting rights, which began in earnest in the mid-19th century and saw significant figures such as Susan B. Anthony and Ida B. Wells advocating for equal voting rights.
When the Nineteenth Amendment was finally passed by Congress in June 1919, it was subsequently ratified by the required number of states, with Tennessee being the 36th state to do so in August 1920. This adoption of the amendment ensured that women could exercise their democratic right to vote in the presidential election of 1920. This significant extension to democracy prohibited voter discrimination on the basis of sex, enabling a greater representation of citizens in the electoral process.
The correct answer to the question is: c) 19th Amendment.