What did the 26th Amendment achieve?

The 26th Amendment, ratified in 1971, specifically lowered the voting age in the United States from 21 to 18 years old. This change was significant as it acknowledged that younger citizens, particularly those who were eligible for the military draft during the Vietnam War, should also have the right to vote. The amendment aimed to enhance democratic participation by allowing a greater segment of the population to engage in the electoral process, reflecting a broader understanding of citizenship and civic responsibility.

The other options address important civil rights issues but are not related to the 26th Amendment. Abolishing poll taxes pertains to the 24th Amendment, women's suffrage is established by the 19th Amendment, and the right to free speech is protected under the First Amendment. Thus, option C correctly identifies the specific achievement of the 26th Amendment.